Rollup merge of #57493 - euclio:deref-suggest, r=oli-obk
use structured suggestion when casting a reference
This commit is contained in:
commit
e0cea0db5d
4 changed files with 20 additions and 23 deletions
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@ -213,8 +213,14 @@ impl<'a, 'gcx, 'tcx> CastCheck<'tcx> {
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fcx.ty_to_string(self.expr_ty),
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cast_ty));
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if let Ok(snippet) = fcx.sess().source_map().span_to_snippet(self.expr.span) {
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err.span_help(self.expr.span,
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&format!("did you mean `*{}`?", snippet));
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err.span_suggestion_with_applicability(
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self.expr.span,
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"dereference the expression",
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format!("*{}", snippet),
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Applicability::MaybeIncorrect,
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);
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} else {
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err.span_help(self.expr.span, "dereference the expression with `*`");
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}
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err.emit();
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}
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@ -2,13 +2,10 @@ error[E0606]: casting `&u8` as `u8` is invalid
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--> $DIR/E0606.rs:2:5
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LL | &0u8 as u8; //~ ERROR E0606
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| ^^^^^^^^^^ cannot cast `&u8` as `u8`
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help: did you mean `*&0u8`?
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--> $DIR/E0606.rs:2:5
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LL | &0u8 as u8; //~ ERROR E0606
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| ^^^^
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| ----^^^^^^
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| |
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| cannot cast `&u8` as `u8`
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| help: dereference the expression: `*&0u8`
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error: aborting due to previous error
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@ -60,13 +60,10 @@ error[E0606]: casting `&u8` as `u32` is invalid
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--> $DIR/error-festival.rs:37:18
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LL | let y: u32 = x as u32;
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| ^^^^^^^^ cannot cast `&u8` as `u32`
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help: did you mean `*x`?
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--> $DIR/error-festival.rs:37:18
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LL | let y: u32 = x as u32;
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| ^
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| -^^^^^^^
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| |
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| cannot cast `&u8` as `u32`
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| help: dereference the expression: `*x`
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error[E0607]: cannot cast thin pointer `*const u8` to fat pointer `*const [u8]`
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--> $DIR/error-festival.rs:41:5
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@ -240,13 +240,10 @@ error[E0606]: casting `&{float}` as `f32` is invalid
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--> $DIR/cast-rfc0401.rs:71:30
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LL | vec![0.0].iter().map(|s| s as f32).collect::<Vec<f32>>(); //~ ERROR is invalid
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| ^^^^^^^^ cannot cast `&{float}` as `f32`
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help: did you mean `*s`?
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--> $DIR/cast-rfc0401.rs:71:30
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LL | vec![0.0].iter().map(|s| s as f32).collect::<Vec<f32>>(); //~ ERROR is invalid
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| ^
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| -^^^^^^^
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| |
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| cannot cast `&{float}` as `f32`
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| help: dereference the expression: `*s`
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error: aborting due to 34 previous errors
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