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Stop calling unwrap when format foreign has trailing dollar #145905

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Merged
merged 2 commits into from
Aug 27, 2025
Merged

Stop calling unwrap when format foreign has trailing dollar #145905

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adddae6
stop returning errors when format foreign has trailing dollar
TaKO8Ki Aug 26, 2025
2c361f8
remove old crash test
TaKO8Ki Aug 27, 2025
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2 changes: 1 addition & 1 deletion compiler/rustc_builtin_macros/src/format_foreign.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -416,7 +416,7 @@ pub(crate) mod printf {
// Yes, this *is* the parameter.
Some(('$', end2)) => {
state = Flags;
parameter = Some(at.slice_between(end).unwrap().parse().unwrap());
parameter = at.slice_between(end).unwrap().parse().ok();
move_to!(end2);
}
// Wait, no, actually, it's the width.
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4 changes: 4 additions & 0 deletions tests/ui/macros/format-foreign-dollar-without-spec.rs
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@@ -0,0 +1,4 @@
fn main() {
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@nnethercote nnethercote Aug 26, 2025

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Add a comment here saying that this was issue #137580, then remove the old crashtest, and then r=me.

println!("%65536$", 1);
//~^ ERROR never used
}
16 changes: 16 additions & 0 deletions tests/ui/macros/format-foreign-dollar-without-spec.stderr
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Original file line number Diff line number Diff line change
@@ -0,0 +1,16 @@
error: argument never used
--> $DIR/format-foreign-dollar-without-spec.rs:2:25
|
LL | println!("%65536$", 1);
| ^ argument never used
|
note: format specifiers use curly braces, and the conversion specifier `
` is unknown or unsupported
--> $DIR/format-foreign-dollar-without-spec.rs:2:15
|
LL | println!("%65536$", 1);
| ^^^^^^^^
= note: printf formatting is not supported; see the documentation for `std::fmt`

error: aborting due to 1 previous error

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