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Rollup merge of #124000 - compiler-errors:sugg-tweaks, r=wesleywiser 

Use `/* value */` as a placeholder

The expression `value` isn't a valid suggestion; let's use `/* value */` as a placeholder (which is also invalid) since it more clearly signals to the user that they need to fill it in with something meaningful. This parallels the suggestions we have in a couple other places, like arguments.

We could also print the type name instead of `/* value */`, especially if it's suggestable, but I don't care strongly about that.
This commit is contained in:
Guillaume Gomez 2024-04-17 00:00:23 +02:00 committed by GitHub
parent ec1618cf17 c95761385e
commit 4764dceb0f
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11 changed files with 41 additions and 34 deletions
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15
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -4545,7 +4545,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
self.type_implements_trait(default_trait, [ty], param_env).must_apply_modulo_regions()
};
Some(match ty.kind() {
Some(match *ty.kind() {
ty::Never | ty::Error(_) => return None,
ty::Bool => "false".to_string(),
ty::Char => "\'x\'".to_string(),
@ -4572,12 +4572,19 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
if let (ty::Str, hir::Mutability::Not) = (ty.kind(), mutability) {
"\"\"".to_string()
} else {
let ty = self.ty_kind_suggestion(param_env, *ty)?;
let ty = self.ty_kind_suggestion(param_env, ty)?;
format!("&{}{ty}", mutability.prefix_str())
}
}
ty::Array(ty, len) if let Some(len) = len.try_eval_target_usize(tcx, param_env) => {
format!("[{}; {}]", self.ty_kind_suggestion(param_env, *ty)?, len)
if len == 0 {
"[]".to_string()
} else if self.type_is_copy_modulo_regions(param_env, ty) || len == 1 {
// Can only suggest `[ty; 0]` if sz == 1 or copy
format!("[{}; {}]", self.ty_kind_suggestion(param_env, ty)?, len)
} else {
"/* value */".to_string()
}
}
ty::Tuple(tys) => format!(
"({}{})",
@ -4587,7 +4594,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
.join(", "),
if tys.len() == 1 { "," } else { "" }
),
_ => "value".to_string(),
_ => "/* value */".to_string(),
})
}
}

4
tests/ui/borrowck/borrowck-init-in-fru.stderr
View File

@ -8,8 +8,8 @@ LL | origin = Point { x: 10, ..origin };
|
help: consider assigning a value
|
LL | let mut origin: Point = value;
| +++++++
LL | let mut origin: Point = /* value */;
| +++++++++++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-uninit-ref-chain.stderr
View File

@ -21,8 +21,8 @@ LL | let _y = &**x;
|
help: consider assigning a value
|
LL | let x: &&S<i32, i32> = &&value;
| +++++++++
LL | let x: &&S<i32, i32> = &&/* value */;
| +++++++++++++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-ref-chain.rs:14:14

4
tests/ui/borrowck/issue-103250.stderr
View File

@ -9,8 +9,8 @@ LL | Err(last_error)
|
help: consider assigning a value
|
LL | let mut last_error: Box<dyn std::error::Error> = Box::new(value);
| +++++++++++++++++
LL | let mut last_error: Box<dyn std::error::Error> = Box::new(/* value */);
| +++++++++++++++++++++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/suggest-assign-rvalue.stderr
View File

@ -50,8 +50,8 @@ LL | println!("demo_no: {:?}", demo_no);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let demo_no: DemoNoDef = value;
| +++++++
LL | let demo_no: DemoNoDef = /* value */;
| +++++++++++++
error[E0381]: used binding `arr` isn't initialized
--> $DIR/suggest-assign-rvalue.rs:34:27

4
tests/ui/consts/value-suggestion-ice-123906.stderr
View File

@ -10,8 +10,8 @@ LL | break;
|
help: give the `break` a value of the expected type
|
LL | break value;
| +++++
LL | break /* value */;
| +++++++++++
error: aborting due to 1 previous error

20
tests/ui/loops/loop-break-value.stderr
View File

@ -246,8 +246,8 @@ LL | break;
|
help: give the `break` a value of the expected type
|
LL | break value;
| +++++
LL | break /* value */;
| +++++++++++
error[E0308]: mismatched types
--> $DIR/loop-break-value.rs:112:9
@ -260,8 +260,8 @@ LL | break;
|
help: give the `break` a value of the expected type
|
LL | break value;
| +++++
LL | break /* value */;
| +++++++++++
error[E0308]: mismatched types
--> $DIR/loop-break-value.rs:124:9
@ -274,8 +274,8 @@ LL | break 'a;
|
help: give the `break` a value of the expected type
|
LL | break 'a value;
| +++++
LL | break 'a /* value */;
| +++++++++++
error[E0308]: mismatched types
--> $DIR/loop-break-value.rs:135:15
@ -297,8 +297,8 @@ LL | break 'a;
|
help: give the `break` a value of the expected type
|
LL | break 'a value;
| +++++
LL | break 'a /* value */;
| +++++++++++
error[E0308]: mismatched types
--> $DIR/loop-break-value.rs:147:15
@ -320,8 +320,8 @@ LL | break 'a;
|
help: give the `break` a value of the expected type
|
LL | break 'a value;
| +++++
LL | break 'a /* value */;
| +++++++++++
error[E0308]: mismatched types
--> $DIR/loop-break-value.rs:159:15

8
tests/ui/moves/issue-72649-uninit-in-loop.stderr
View File

@ -80,8 +80,8 @@ LL | let _used = value;
|
help: consider assigning a value
|
LL | let value: NonCopy = value;
| +++++++
LL | let value: NonCopy = /* value */;
| +++++++++++++
error[E0381]: used binding `value` isn't initialized
--> $DIR/issue-72649-uninit-in-loop.rs:73:21
@ -94,8 +94,8 @@ LL | let _used = value;
|
help: consider assigning a value
|
LL | let mut value: NonCopy = value;
| +++++++
LL | let mut value: NonCopy = /* value */;
| +++++++++++++
error: aborting due to 6 previous errors

4
tests/ui/moves/move-into-dead-array-1.stderr
View File

@ -8,8 +8,8 @@ LL | a[i] = d();
|
help: consider assigning a value
|
LL | let mut a: [D; 4] = [value; 4];
| ++++++++++++
LL | let mut a: [D; 4] = /* value */;
| +++++++++++++
error: aborting due to 1 previous error

4
tests/ui/moves/move-of-addr-of-mut.stderr
View File

@ -9,8 +9,8 @@ LL | std::ptr::addr_of_mut!(x);
= note: this error originates in the macro `std::ptr::addr_of_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let mut x: S = value;
| +++++++
LL | let mut x: S = /* value */;
| +++++++++++++
error: aborting due to 1 previous error

4
tests/ui/nll/match-on-borrowed.stderr
View File

@ -43,8 +43,8 @@ LL | match n {}
|
help: consider assigning a value
|
LL | let n: Never = value;
| +++++++
LL | let n: Never = /* value */;
| +++++++++++++
error: aborting due to 4 previous errors