bjoernager/rust
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Only suggest 1-tuple if expected and found types match

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This commit is contained in:
Rob Pilling 2022-01-28 23:17:47 +00:00
parent 18cea90d4a
commit 91a43f0423
2 changed files with 27 additions and 23 deletions
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12
compiler/rustc_infer/src/infer/error_reporting/mod.rs
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@ -2044,8 +2044,14 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
// If a tuple of length one was expected and the found expression has
// parentheses around it, perhaps the user meant to write `(expr,)` to
// build a tuple (issue #86100)
(ty::Tuple(_), _) if expected.tuple_fields().count() == 1 => {
if let Ok(code) = self.tcx.sess().source_map().span_to_snippet(span) {
(ty::Tuple(_), _) => {
if let [expected_tup_elem] =
expected.tuple_fields().collect::<Vec<_>>()[..]
{
if same_type_modulo_infer(expected_tup_elem, found) {
if let Ok(code) =
self.tcx.sess().source_map().span_to_snippet(span)
{
if code.starts_with('(') && code.ends_with(')') {
let before_close = span.hi() - BytePos::from_u32(1);
@ -2067,6 +2073,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
}
}
}
}
}
// If a character was expected and the found expression is a string literal
// containing a single character, perhaps the user meant to write `'c'` to
// specify a character literal (issue #92479)

4
src/test/ui/typeck/issue-84768.stderr
View file

@ -12,10 +12,6 @@ LL | <F as FnOnce(&mut u8)>::call_once(f, 1)
|
= note: expected tuple `(&mut u8,)`
found type `{integer}`
help: use a trailing comma to create a tuple with one element
|
LL | <F as FnOnce(&mut u8)>::call_once(f, (1,))
| + ++
error: aborting due to 2 previous errors