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Auto traits in dyn are suggestable

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This commit is contained in:
Michael Goulet 2022-12-12 19:23:20 +00:00
parent ba64ba8b0d
commit cfa6a93a36
3 changed files with 29 additions and 13 deletions
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15
compiler/rustc_middle/src/ty/diagnostics.rs
View File

@ -3,8 +3,8 @@
use std::ops::ControlFlow;
use crate::ty::{
visit::TypeVisitable, AliasTy, Const, ConstKind, DefIdTree, ExistentialPredicate, InferConst,
InferTy, Opaque, PolyTraitPredicate, Ty, TyCtxt, TypeSuperVisitable, TypeVisitor,
visit::TypeVisitable, AliasTy, Const, ConstKind, DefIdTree, InferConst, InferTy, Opaque,
PolyTraitPredicate, Ty, TyCtxt, TypeSuperVisitable, TypeVisitor,
};
use rustc_data_structures::fx::FxHashMap;
@ -469,17 +469,6 @@ impl<'tcx> TypeVisitor<'tcx> for IsSuggestableVisitor<'tcx> {
}
}
Dynamic(dty, _, _) => {
for pred in *dty {
match pred.skip_binder() {
ExistentialPredicate::Trait(_) | ExistentialPredicate::Projection(_) => {
// Okay
}
_ => return ControlFlow::Break(()),
}
}
}
Param(param) => {
// FIXME: It would be nice to make this not use string manipulation,
// but it's pretty hard to do this, since `ty::ParamTy` is missing

8
src/test/ui/argument-suggestions/display-is-suggestable.rs Normal file
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@ -0,0 +1,8 @@
use std::fmt::Display;
fn foo(x: &(dyn Display + Send)) {}
fn main() {
foo();
//~^ ERROR this function takes 1 argument but 0 arguments were supplied
}

19
src/test/ui/argument-suggestions/display-is-suggestable.stderr Normal file
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@ -0,0 +1,19 @@
error[E0061]: this function takes 1 argument but 0 arguments were supplied
--> $DIR/display-is-suggestable.rs:6:5
|
LL | foo();
| ^^^-- an argument of type `&dyn std::fmt::Display + Send` is missing
|
note: function defined here
--> $DIR/display-is-suggestable.rs:3:4
|
LL | fn foo(x: &(dyn Display + Send)) {}
| ^^^ ------------------------
help: provide the argument
|
LL | foo(/* &dyn std::fmt::Display + Send */);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error: aborting due to previous error
For more information about this error, try `rustc --explain E0061`.