[crater] make SEMICOLON_IN_EXPRESSIONS_FROM_MACROS a hard error by RalfJung · Pull Request #162768 · rust-lang/rust

RalfJung · 2026-09-14T13:25:24Z

Crater experiment, see Zulip for context.

RalfJung · 2026-09-14T13:25:57Z

[crater] make SEMICOLON_IN_EXPRESSIONS_FROM_MACROS a hard error

rust-bors · 2026-09-14T14:24:42Z

☀️ Try build successful (CI)
Build commit: c92d9dd (c92d9dd0ee795cc0dcd31ea2dddf20fc01db2e4d)
Base parent: ed77b7b (ed77b7b8699e342c2dc842c83cb5fe4025252ee8)

rust-log-analyzer · 2026-09-14T14:26:34Z

The job test-aarch64-gnu-llvm-21-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

---- [ui] tests/ui/lint/expect-future_breakage-crash-issue-126521.rs stdout ----

error: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/lint/expect-future_breakage-crash-issue-126521.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/lint/expect-future_breakage-crash-issue-126521" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/lint/expect-future_breakage-crash-issue-126521.rs:7:13
   |
LL |         true;
   |             ^
...
LL |     let _ = foo!(x);
   |             ------- in this macro invocation
   |
   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/lint/expect-future_breakage-crash-issue-126521.rs:13:35
   |
LL |         (5_i32.overflowing_sub(3));
   |                                   ^
...
LL |     let _ = bar!(x);
   |             ------- in this macro invocation
   |
   = note: this error originates in the macro `bar` (in Nightly builds, run with -Z macro-backtrace for more info)

error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/lint/expect-future_breakage-crash-issue-126521.rs:7:13
   |
LL |         true;
   |             ^
...
LL |     let _ = foo!(x);
   |             ------- in this macro invocation
   |
   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/lint/expect-future_breakage-crash-issue-126521.rs:13:35
   |
LL |         (5_i32.overflowing_sub(3));
   |                                   ^
...
LL |     let _ = bar!(x);
   |             ------- in this macro invocation
   |
   = note: this error originates in the macro `bar` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 4 previous errors
------------------------------------------

---- [ui] tests/ui/lint/expect-future_breakage-crash-issue-126521.rs stdout end ----
---- [ui] tests/ui/lint/semicolon-in-expressions-from-macros/semicolon-in-expressions-from-macros.rs stdout ----

error: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/lint/semicolon-in-expressions-from-macros/semicolon-in-expressions-from-macros.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/lint/semicolon-in-expressions-from-macros/semicolon-in-expressions-from-macros" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018"
stdout: none
--- stderr -------------------------------
error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/lint/semicolon-in-expressions-from-macros/semicolon-in-expressions-from-macros.rs:9:13
   |
---
   |
LL |         true; //~  WARN trailing semicolon in macro
   |             ^
...
LL |         let _ = foo!(third);
   |                 ----------- in this macro invocation
   |
   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/lint/semicolon-in-expressions-from-macros/semicolon-in-expressions-from-macros.rs:9:13
   |
LL |         true; //~  WARN trailing semicolon in macro
   |             ^
...
LL |         let _ = foo!(fourth);
   |                 ------------ in this macro invocation
   |
   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: trailing semicolon in macro used in expression position
---
   |
LL |         true; //~  WARN trailing semicolon in macro
   |             ^
...
LL |     let _ = foo!(warn_in_expr);
   |             ------------------ in this macro invocation
   |
   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/lint/semicolon-in-expressions-from-macros/semicolon-in-expressions-from-macros.rs:9:13
   |
LL |         true; //~  WARN trailing semicolon in macro
   |             ^
...
LL |     let _ = #[allow(semicolon_in_expressions_from_macros)] foo!(allow_does_not_work);
   |                                                            ------------------------- in this macro invocation
   |
   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unused attribute `allow`
##[warning]  --> /checkout/tests/ui/lint/semicolon-in-expressions-from-macros/semicolon-in-expressions-from-macros.rs:50:13
   |
LL |     let _ = #[allow(semicolon_in_expressions_from_macros)] foo!(allow_does_not_work);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: the built-in attribute `allow` will be ignored, since it's applied to the macro invocation `foo`
  --> /checkout/tests/ui/lint/semicolon-in-expressions-from-macros/semicolon-in-expressions-from-macros.rs:50:60
   |
LL |     let _ = #[allow(semicolon_in_expressions_from_macros)] foo!(allow_does_not_work);
   |                                                            ^^^
   = note: requested on the command line with `-W unused-attributes`

error: aborting due to 7 previous errors; 1 warning emitted
------------------------------------------
---
8    |              ------ in this macro invocation
9    |
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
-    = note: `#[deny(semicolon_in_expressions_from_macros)]` (part of `#[deny(future_incompatible)]`) on by default
13    = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)
14 
15 error: aborting due to 1 previous error

- 
- Future incompatibility report: Future breakage diagnostic:
---
-    |              ------ in this macro invocation
-    |
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
-    = note: `#[deny(semicolon_in_expressions_from_macros)]` (part of `#[deny(future_incompatible)]`) on by default
-    = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)
31 
32 


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args lint/semicolon-in-expressions-from-macros/warn-semicolon-in-expressions-from-macros.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/lint/semicolon-in-expressions-from-macros/warn-semicolon-in-expressions-from-macros.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/lint/semicolon-in-expressions-from-macros/warn-semicolon-in-expressions-from-macros" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/lint/semicolon-in-expressions-from-macros/warn-semicolon-in-expressions-from-macros.rs:5:13
   |
---
To only update this specific test, also pass `--test-args lint/semicolon-in-expressions-from-macros/foreign-crate.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/lint/semicolon-in-expressions-from-macros/foreign-crate.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/lint/semicolon-in-expressions-from-macros/foreign-crate" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/lint/semicolon-in-expressions-from-macros/foreign-crate/auxiliary"
stdout: none
--- stderr -------------------------------
error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/lint/semicolon-in-expressions-from-macros/foreign-crate.rs:8:13
   |
---
---- [ui] tests/ui/macros/issue-84195-lint-anon-const.rs stdout ----
Saved the actual stderr to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/macros/issue-84195-lint-anon-const/issue-84195-lint-anon-const.stderr`
diff of stderr:

7 LL |     let val: [u8; len!()] = [];
8    |                   ------ in this macro invocation
9    |
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
- note: the lint level is defined here
---
-    |
- LL |     () => { 0; };
-    |              ^
- ...
- LL |     let val: [u8; len!()] = [];
-    |                   ------ in this macro invocation
-    |
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
- note: the lint level is defined here
---
To only update this specific test, also pass `--test-args macros/issue-84195-lint-anon-const.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/macros/issue-84195-lint-anon-const.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/macros/issue-84195-lint-anon-const" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/macros/issue-84195-lint-anon-const.rs:8:14
   |
LL |     () => { 0; }; //~  ERROR trailing semicolon
   |              ^
...
LL |     let val: [u8; len!()] = [];
   |                   ------ in this macro invocation
   |
   = note: this error originates in the macro `len` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 1 previous error
---
10    = note: macro invocations at the end of a block are treated as expressions
11    = note: to ignore the value produced by the macro, add a semicolon after the invocation of `expand_it`
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
-    = note: `#[deny(semicolon_in_expressions_from_macros)]` (part of `#[deny(future_incompatible)]`) on by default
15    = note: this error originates in the macro `expand_it` (in Nightly builds, run with -Z macro-backtrace for more info)
16 
17 error: aborting due to 1 previous error

- 
- Future incompatibility report: Future breakage diagnostic:
---
-    = note: macro invocations at the end of a block are treated as expressions
-    = note: to ignore the value produced by the macro, add a semicolon after the invocation of `expand_it`
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
-    = note: `#[deny(semicolon_in_expressions_from_macros)]` (part of `#[deny(future_incompatible)]`) on by default
-    = note: this error originates in the macro `expand_it` (in Nightly builds, run with -Z macro-backtrace for more info)
35 
36 


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args macros/lint-trailing-macro-call.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/macros/lint-trailing-macro-call.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/macros/lint-trailing-macro-call" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/macros/lint-trailing-macro-call.rs:7:25
   |
LL |         #[cfg(false)] 25; //~  ERROR trailing semicolon in macro
   |                         ^
...
LL |     expand_it!()
   |     ------------ in this macro invocation
   |
---
11 
+ error: trailing semicolon in macro used in expression position
+   --> $DIR/macro-context.rs:3:15
+    |
+ LL |     () => ( i ; typeof );
+    |               ^
+ ...
+ LL |     let i = m!();
+    |             ---- in this macro invocation
+    |
---
70 
- error: trailing semicolon in macro used in expression position
-   --> $DIR/macro-context.rs:3:15
-    |
- LL |     () => ( i ; typeof );
-    |               ^
- ...
- LL |     let i = m!();
-    |             ---- in this macro invocation
-    |
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
-    = note: `#[deny(semicolon_in_expressions_from_macros)]` (part of `#[deny(future_incompatible)]`) on by default
-    = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
- 
85 error: aborting due to 7 previous errors
86 
87 For more information about this error, try `rustc --explain E0425`.

- Future incompatibility report: Future breakage diagnostic:
- error: trailing semicolon in macro used in expression position
-   --> $DIR/macro-context.rs:3:15
-    |
- LL |     () => ( i ; typeof );
-    |               ^
- ...
- LL |     let i = m!();
-    |             ---- in this macro invocation
-    |
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
-    = note: `#[deny(semicolon_in_expressions_from_macros)]` (part of `#[deny(future_incompatible)]`) on by default
-    = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
- 
103 

Note: some mismatched output was normalized before being compared
-   --> /checkout/tests/ui/macros/macro-context.rs:3:15
- LL |     () => ( i ; typeof );   //~ ERROR expected expression, found reserved keyword `typeof`
+ error: trailing semicolon in macro used in expression position
+   --> $DIR/macro-context.rs:3:15
+    |
+ LL |     () => ( i ; typeof );
+    |               ^
+ ...
+ LL |     let i = m!();
+    |             ---- in this macro invocation
+    |
---
To only update this specific test, also pass `--test-args macros/macro-context.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/macros/macro-context.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/macros/macro-context" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: macro expansion ignores `;` and any tokens following
##[error]  --> /checkout/tests/ui/macros/macro-context.rs:3:15
   |
LL |     () => ( i ; typeof );   //~ ERROR expected expression, found reserved keyword `typeof`
   |               ^
...
LL |     let a: m!();
   |            ---- caused by the macro expansion here
   |
   = note: the usage of `m!` is likely invalid in type context

error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/macros/macro-context.rs:3:15
   |
LL |     () => ( i ; typeof );   //~ ERROR expected expression, found reserved keyword `typeof`
   |               ^
...
LL |     let i = m!();
   |             ---- in this macro invocation
   |
   = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)

error: macro expansion ignores reserved keyword `typeof` and any tokens following
##[error]  --> /checkout/tests/ui/macros/macro-context.rs:3:17
   |
LL |     () => ( i ; typeof );   //~ ERROR expected expression, found reserved keyword `typeof`
   |                 ^^^^^^
...
LL |     let i = m!();
   |             ---- caused by the macro expansion here
   |
   = note: the usage of `m!` is likely invalid in expression context

error: macro expansion ignores `;` and any tokens following
##[error]  --> /checkout/tests/ui/macros/macro-context.rs:3:15
   |
LL |     () => ( i ; typeof );   //~ ERROR expected expression, found reserved keyword `typeof`
   |               ^
...
LL |         m!() => {}
   |         ---- caused by the macro expansion here
   |
   = note: the usage of `m!` is likely invalid in pattern context

error: expected expression, found reserved keyword `typeof`
##[error]  --> /checkout/tests/ui/macros/macro-context.rs:3:17
   |
LL |     () => ( i ; typeof );   //~ ERROR expected expression, found reserved keyword `typeof`
   |                 ^^^^^^ expected expression
...
LL |     m!();
   |     ---- in this macro invocation
   |
   = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0425]: cannot find type `i` in this scope
##[error]  --> /checkout/tests/ui/macros/macro-context.rs:3:13
   |
LL |     () => ( i ; typeof );   //~ ERROR expected expression, found reserved keyword `typeof`
   |             ^ not found in this scope
...
LL |     let a: m!();
   |            ---- in this macro invocation
   |
   = note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
help: a builtin type with a similar name exists
   |
LL |     () => ( i8 ; typeof );   //~ ERROR expected expression, found reserved keyword `typeof`
   |              +

error[E0425]: cannot find value `i` in this scope
##[error]  --> /checkout/tests/ui/macros/macro-context.rs:3:13
   |
LL |     () => ( i ; typeof );   //~ ERROR expected expression, found reserved keyword `typeof`
   |             ^ not found in this scope
...
LL |     let i = m!();
   |             ---- in this macro invocation
   |
---

- error: macro expansion ignores `assert_eq` and any tokens following
-   --> $DIR/macro-in-expression-context.rs:12:9
-    |
- LL |         assert_eq!("B", "B");
-    |         ^^^^^^^^^
- ...
- LL |     foo!()
-    |     ------ caused by the macro expansion here
-    |
---
25    = note: macro invocations at the end of a block are treated as expressions
26    = note: to ignore the value produced by the macro, add a semicolon after the invocation of `foo`
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
-    = note: `#[deny(semicolon_in_expressions_from_macros)]` (part of `#[deny(future_incompatible)]`) on by default
30    = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)
31 
- error: aborting due to 2 previous errors
- 
- Future incompatibility report: Future breakage diagnostic:
- error: trailing semicolon in macro used in expression position
-   --> $DIR/macro-in-expression-context.rs:5:29
+ error: macro expansion ignores `assert_eq` and any tokens following
+   --> $DIR/macro-in-expression-context.rs:12:9
37    |
- LL |         assert_eq!("A", "A");
-    |                             ^
+ LL |         assert_eq!("B", "B");
+    |         ^^^^^^^^^
40 ...
41 LL |     foo!()
-    |     ------ in this macro invocation
+    |     ------ caused by the macro expansion here
43    |
-    = note: macro invocations at the end of a block are treated as expressions
-    = note: to ignore the value produced by the macro, add a semicolon after the invocation of `foo`
-    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
-    = note: `#[deny(semicolon_in_expressions_from_macros)]` (part of `#[deny(future_incompatible)]`) on by default
-    = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)
+    = note: the usage of `foo!` is likely invalid in expression context
+ help: you might be missing a semicolon here
+    |
+ LL |     foo!();
+    |           +
+ 
+ error: aborting due to 2 previous errors
50 
51 

Note: some mismatched output was normalized before being compared
-   --> /checkout/tests/ui/macros/macro-in-expression-context.rs:12:9
+ error: macro expansion ignores `assert_eq` and any tokens following
+   --> $DIR/macro-in-expression-context.rs:12:9
+ LL |         assert_eq!("B", "B");
+    |         ^^^^^^^^^
+    |     ------ caused by the macro expansion here
+    = note: the usage of `foo!` is likely invalid in expression context
+ help: you might be missing a semicolon here
+    |
---
To only update this specific test, also pass `--test-args macros/macro-in-expression-context.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/macros/macro-in-expression-context.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/macros/macro-in-expression-context" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/macros/macro-in-expression-context.rs:5:29
   |
LL |         assert_eq!("A", "A");
   |                             ^
...
LL |     foo!()
   |     ------ in this macro invocation
   |
   = note: macro invocations at the end of a block are treated as expressions
   = note: to ignore the value produced by the macro, add a semicolon after the invocation of `foo`
   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: macro expansion ignores `assert_eq` and any tokens following
##[error]  --> /checkout/tests/ui/macros/macro-in-expression-context.rs:12:9
   |
LL |         assert_eq!("B", "B");
   |         ^^^^^^^^^
...
LL |     foo!()
   |     ------ caused by the macro expansion here
   |
---
---- [ui] tests/ui/macros/trace_faulty_macros.rs stdout ----
Saved the actual stderr to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/macros/trace_faulty_macros/trace_faulty_macros.stderr`
diff of stderr:

50    = note: expanding `my_recursive_macro! {  }`
51    = note: to `my_recursive_macro! ();`
52 
+ error: trailing semicolon in macro used in expression position
+   --> $DIR/trace_faulty_macros.rs:13:41
+    |
+ LL |         pat_macro!(A{a:a, b:0, c:_, ..});
+    |                                         ^
+ ...
+ LL |     let a = pat_macro!();
+    |             ------------ in this macro invocation
+    |
+    = note: this error originates in the macro `pat_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
+ 
53 error: expected expression, found `pat` metavariable
54   --> $DIR/trace_faulty_macros.rs:16:9
55    |

102    = note: expanding `test! { (x, 1+1) }`
103    = note: to `let x = 1+1;`
104 
- error: aborting due to 5 previous errors
+ error: aborting due to 6 previous errors
106 
107 For more information about this error, try `rustc --explain E0774`.
108 

Note: some mismatched output was normalized before being compared
-   --> /checkout/tests/ui/macros/trace_faulty_macros.rs:13:41
+ error: trailing semicolon in macro used in expression position
+   --> $DIR/trace_faulty_macros.rs:13:41
+    |
+ LL |         pat_macro!(A{a:a, b:0, c:_, ..});
+    |                                         ^
+ ...
+ LL |     let a = pat_macro!();
+    |             ------------ in this macro invocation
+    |
---
To only update this specific test, also pass `--test-args macros/trace_faulty_macros.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/macros/trace_faulty_macros.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/macros/trace_faulty_macros" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Z" "trace-macros"
stdout: none
--- stderr -------------------------------
error: no rules expected `bcd`
##[error]  --> /checkout/tests/ui/macros/trace_faulty_macros.rs:7:26
   |
LL | macro_rules! my_faulty_macro {
   | ---------------------------- when calling this macro
LL |     () => {
LL |         my_faulty_macro!(bcd); //~ ERROR no rules
   |                          ^^^ no rules expected this token in macro call
...
LL |     my_faulty_macro!();
   |     ------------------ in this macro invocation
   |
   = note: while trying to match end of macro
---
   |
LL |     my_faulty_macro!();
   |     ^^^^^^^^^^^^^^^^^^
   |
   = note: expanding `my_faulty_macro! {  }`
   = note: to `my_faulty_macro! (bcd);`
   = note: expanding `my_faulty_macro! { bcd }`

error: recursion limit reached while expanding `my_recursive_macro!`
##[error]  --> /checkout/tests/ui/macros/trace_faulty_macros.rs:22:9
   |
LL |         my_recursive_macro!(); //~ ERROR recursion limit
---
   |
LL |     my_recursive_macro!();
   |     ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: expanding `my_recursive_macro! {  }`
   = note: to `my_recursive_macro! ();`
   = note: expanding `my_recursive_macro! {  }`
   = note: to `my_recursive_macro! ();`
   = note: expanding `my_recursive_macro! {  }`
   = note: to `my_recursive_macro! ();`
   = note: expanding `my_recursive_macro! {  }`
   = note: to `my_recursive_macro! ();`

error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/macros/trace_faulty_macros.rs:13:41
   |
LL |         pat_macro!(A{a:a, b:0, c:_, ..});
   |                                         ^
...
LL |     let a = pat_macro!();
   |             ------------ in this macro invocation
   |
   = note: this error originates in the macro `pat_macro` (in Nightly builds, run with -Z macro-backtrace for more info)

error: expected expression, found `pat` metavariable
##[error]  --> /checkout/tests/ui/macros/trace_faulty_macros.rs:16:9
   |
LL |         $a //~ ERROR expected expression
   |         ^^ expected expression
...
LL |     let a = pat_macro!();
   |             ------------ in this macro invocation
   |
   = note: this error originates in the macro `pat_macro` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
##[error]  --> /checkout/tests/ui/macros/trace_faulty_macros.rs:42:1
   |
LL | #[derive(Debug)] //~ ERROR `derive` may only be applied to `struct`s
   | ^^^^^^^^^^^^^^^^ not applicable here
LL | fn use_derive_macro_as_attr() {}
   | -------------------------------- not a `struct`, `enum` or `union`

error: expected expression, found `pat` metavariable
##[error]  --> /checkout/tests/ui/macros/trace_faulty_macros.rs:49:37
   |
LL |     (($p:pat, $e:pat)) => {let $p = $e;}; //~ ERROR expected expression, found `pat` metavariable
   |                                     ^^ expected expression
...
LL |     test!(let x = 1+1);
   |     ------------------ in this macro invocation
   |
---
   |
LL |     let a = pat_macro!();
   |             ^^^^^^^^^^^^
   |
   = note: expanding `pat_macro! {  }`
   = note: to `pat_macro! (A {a : a, b : 0, c : _, ..});`
   = note: expanding `pat_macro! { A {a : a, b : 0, c : _, ..} }`
   = note: to `A {a : a, b : 0, c : _, ..}`

note: trace_macro
  --> /checkout/tests/ui/macros/trace_faulty_macros.rs:53:5
   |
LL |     test!(let x = 1+1);
   |     ^^^^^^^^^^^^^^^^^^
   |
   = note: expanding `test! { let x = 1+1 }`
   = note: to `test! ((x, 1+1))`
   = note: expanding `test! { (x, 1+1) }`
   = note: to `let x = 1+1;`

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0774`.
------------------------------------------

---- [ui] tests/ui/macros/trace_faulty_macros.rs stdout end ----
---- [ui] tests/ui/proc-macro/expand-expr.rs stdout ----
Saved the actual stderr to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/proc-macro/expand-expr/expand-expr.stderr`
diff of stderr:

22 LL | expand_expr_fail!(echo_pm!($));
23    |                            ^ expected expression
24 
+ error: trailing semicolon in macro used in expression position
+   --> $DIR/expand-expr.rs:118:45
+    |
+ LL | expand_expr_is!("string", echo_tts!("string"; hello));
+    |                                             ^
+ 
25 error: macro expansion ignores `hello` and any tokens following
26   --> $DIR/expand-expr.rs:118:47
27    |

55    = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`expand_expr`)
56    = note: this error originates in the macro `recursive_expand` (in Nightly builds, run with -Z macro-backtrace for more info)
---
60 

Note: some mismatched output was normalized before being compared
-   --> /checkout/tests/ui/proc-macro/expand-expr.rs:118:45
- LL | expand_expr_is!("string", echo_tts!("string"; hello)); //~ ERROR: macro expansion ignores `hello` and any tokens following
+ error: trailing semicolon in macro used in expression position
+   --> $DIR/expand-expr.rs:118:45
+    |
+ LL | expand_expr_is!("string", echo_tts!("string"; hello));
+    |                                             ^
+ 
+ error: aborting due to 8 previous errors


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args proc-macro/expand-expr.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/proc-macro/expand-expr.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/proc-macro/expand-expr" "-Znext-solver=coherence" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/proc-macro/expand-expr/auxiliary" "--extern" "expand_expr=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/proc-macro/expand-expr/auxiliary/libexpand_expr.so"
stdout: none
--- stderr -------------------------------
error: expected one of `.`, `?`, or an operator, found `;`
##[error]  --> /checkout/tests/ui/proc-macro/expand-expr.rs:109:27
   |
LL | expand_expr_fail!("string"; hello); //~ ERROR: expected one of `.`, `?`, or an operator, found `;`
   |                           ^ expected one of `.`, `?`, or an operator

error: expected expression, found `$`
##[error]  --> /checkout/tests/ui/proc-macro/expand-expr.rs:112:19
   |
LL | expand_expr_fail!($); //~ ERROR: expected expression, found `$`
   |                   ^ expected expression

error: expected expression, found `$`
##[error]  --> /checkout/tests/ui/proc-macro/expand-expr.rs:113:29
   |
LL | expand_expr_fail!(echo_tts!($)); //~ ERROR: expected expression, found `$`
   |                             ^ expected expression

error: expected expression, found `$`
##[error]  --> /checkout/tests/ui/proc-macro/expand-expr.rs:114:28
   |
LL | expand_expr_fail!(echo_pm!($)); //~ ERROR: expected expression, found `$`
   |                            ^ expected expression

error: trailing semicolon in macro used in expression position
##[error]  --> /checkout/tests/ui/proc-macro/expand-expr.rs:118:45
   |
LL | expand_expr_is!("string", echo_tts!("string"; hello)); //~ ERROR: macro expansion ignores `hello` and any tokens following
   |                                             ^

error: macro expansion ignores `hello` and any tokens following
##[error]  --> /checkout/tests/ui/proc-macro/expand-expr.rs:118:47
   |
LL | expand_expr_is!("string", echo_tts!("string"; hello)); //~ ERROR: macro expansion ignores `hello` and any tokens following
   |                           --------------------^^^^^- caused by the macro expansion here
   |
   = note: the usage of `echo_tts!` is likely invalid in expression context
help: you might be missing a semicolon here
   |
LL | expand_expr_is!("string", echo_tts!("string"; hello);); //~ ERROR: macro expansion ignores `hello` and any tokens following
   |                                                     +

error: macro expansion ignores `;` and any tokens following
##[error]  --> /checkout/tests/ui/proc-macro/expand-expr.rs:119:44
   |
LL | expand_expr_is!("string", echo_pm!("string"; hello)); //~ ERROR: macro expansion ignores `;` and any tokens following
   |                           -----------------^------- caused by the macro expansion here
   |
   = note: the usage of `echo_pm!` is likely invalid in expression context
help: you might be missing a semicolon here
   |
LL | expand_expr_is!("string", echo_pm!("string"; hello);); //~ ERROR: macro expansion ignores `;` and any tokens following
   |                                                    +

error: recursion limit reached while expanding `recursive_expand!`
##[error]  --> /checkout/tests/ui/proc-macro/expand-expr.rs:127:16
   |
LL | const _: u32 = recursive_expand!(); //~ ERROR: recursion limit reached while expanding `recursive_expand!`
   |                ^^^^^^^^^^^^^^^^^^^
   |
   = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`expand_expr`)
   = note: this error originates in the macro `recursive_expand` (in Nightly builds, run with -Z macro-backtrace for more info)

RalfJung · 2026-09-14T14:44:19Z

@craterbot check

craterbot · 2026-09-14T14:45:02Z

👌 Experiment pr-162768 created and queued.
🤖 Automatically detected try build c92d9dd
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

[crater] make SEMICOLON_IN_EXPRESSIONS_FROM_MACROS a hard error

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rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Sep 14, 2026

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rust-bors Bot pushed a commit that referenced this pull request Sep 14, 2026

Auto merge of #162768 - RalfJung:semicolons-in-expressions, r=<try>

c92d9dd

[crater] make SEMICOLON_IN_EXPRESSIONS_FROM_MACROS a hard error

craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Sep 14, 2026

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[crater] make SEMICOLON_IN_EXPRESSIONS_FROM_MACROS a hard error - #162768

[crater] make SEMICOLON_IN_EXPRESSIONS_FROM_MACROS a hard error#162768
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