diff --git a/compiler/rustc_parse/src/parser/mod.rs b/compiler/rustc_parse/src/parser/mod.rs index b277cb804fa..fafd1b1ae00 100644 --- a/compiler/rustc_parse/src/parser/mod.rs +++ b/compiler/rustc_parse/src/parser/mod.rs @@ -782,9 +782,16 @@ impl<'a> Parser<'a> { // Recovery is disabled when parsing macro arguments, so it must // also be disabled when reparsing pasted macro arguments, // otherwise we get inconsistent results (e.g. #137874). - let res = self.with_recovery(Recovery::Forbidden, |this| { - f(this).expect("failed to reparse {mv_kind:?}") - }); + let res = self.with_recovery(Recovery::Forbidden, |this| f(this)); + + let res = match res { + Ok(res) => res, + Err(err) => { + // This can occur in unusual error cases, e.g. #139445. + err.delay_as_bug(); + return None; + } + }; if let token::CloseDelim(delim) = self.token.kind && let Delimiter::Invisible(InvisibleOrigin::MetaVar(mv_kind)) = delim diff --git a/tests/ui/macros/failed-to-reparse-issue-139445.rs b/tests/ui/macros/failed-to-reparse-issue-139445.rs new file mode 100644 index 00000000000..babe26b9d29 --- /dev/null +++ b/tests/ui/macros/failed-to-reparse-issue-139445.rs @@ -0,0 +1,6 @@ +fn main() { + assert_eq!(3, 'a,) + //~^ ERROR expected `while`, `for`, `loop` or `{` after a label + //~| ERROR expected `while`, `for`, `loop` or `{` after a label + //~| ERROR expected expression, found `` +} diff --git a/tests/ui/macros/failed-to-reparse-issue-139445.stderr b/tests/ui/macros/failed-to-reparse-issue-139445.stderr new file mode 100644 index 00000000000..6f7d88fb344 --- /dev/null +++ b/tests/ui/macros/failed-to-reparse-issue-139445.stderr @@ -0,0 +1,24 @@ +error: expected `while`, `for`, `loop` or `{` after a label + --> $DIR/failed-to-reparse-issue-139445.rs:2:21 + | +LL | assert_eq!(3, 'a,) + | ^ expected `while`, `for`, `loop` or `{` after a label + +error: expected `while`, `for`, `loop` or `{` after a label + --> $DIR/failed-to-reparse-issue-139445.rs:2:5 + | +LL | assert_eq!(3, 'a,) + | ^^^^^^^^^^^^^^^^^^ expected `while`, `for`, `loop` or `{` after a label + | + = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info) + +error: expected expression, found `` + --> $DIR/failed-to-reparse-issue-139445.rs:2:5 + | +LL | assert_eq!(3, 'a,) + | ^^^^^^^^^^^^^^^^^^ expected expression + | + = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info) + +error: aborting due to 3 previous errors +