028a920c53
Use a more targeted span when suggesting casting an `fn` item to an `fn` pointer.
```
error[E0308]: cannot coerce functions which must be inlined to function pointers
--> $DIR/cast.rs:10:33
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LL | let _: fn(isize) -> usize = callee;
| ------------------ ^^^^^^ cannot coerce functions which must be inlined to function pointers
| |
| expected due to this
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= note: expected fn pointer `fn(_) -> _`
found fn item `fn(_) -> _ {callee}`
= note: fn items are distinct from fn pointers
help: consider casting to a fn pointer
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LL | let _: fn(isize) -> usize = callee as fn(isize) -> usize;
| +++++++++++++++++++++
```
```
error[E0308]: mismatched types
--> $DIR/fn-pointer-mismatch.rs:42:30
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LL | let d: &fn(u32) -> u32 = foo;
| --------------- ^^^ expected `&fn(u32) -> u32`, found fn item
| |
| expected due to this
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= note: expected reference `&fn(_) -> _`
found fn item `fn(_) -> _ {foo}`
help: consider using a reference
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LL | let d: &fn(u32) -> u32 = &foo;
| +
```
Previously we'd point at the whole expression for replacement, instead of marking what was being added.
We could also modify the suggestions for `&(name as fn())`, but for that we require storing more accurate spans than we have now.
41 lines
1.5 KiB
Plaintext
41 lines
1.5 KiB
Plaintext
error[E0308]: cannot coerce functions which must be inlined to function pointers
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--> $DIR/cast.rs:10:33
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LL | let _: fn(isize) -> usize = callee;
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| ------------------ ^^^^^^ cannot coerce functions which must be inlined to function pointers
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| expected due to this
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= note: expected fn pointer `fn(_) -> _`
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found fn item `fn(_) -> _ {callee}`
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= note: fn items are distinct from fn pointers
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help: consider casting to a fn pointer
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LL | let _: fn(isize) -> usize = callee as fn(isize) -> usize;
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| +++++++++++++++++++++
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error[E0605]: non-primitive cast: `fn(isize) -> usize {callee}` as `fn(isize) -> usize`
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--> $DIR/cast.rs:15:13
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LL | let _ = callee as fn(isize) -> usize;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invalid cast
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error[E0308]: cannot coerce functions which must be inlined to function pointers
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--> $DIR/cast.rs:21:9
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LL | callee,
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| ^^^^^^ cannot coerce functions which must be inlined to function pointers
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= note: expected fn pointer `fn(_) -> _`
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found fn item `fn(_) -> _ {callee}`
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= note: fn items are distinct from fn pointers
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help: consider casting to a fn pointer
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LL | callee as fn(isize) -> usize,
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| +++++++++++++++++++++
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error: aborting due to 3 previous errors
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Some errors have detailed explanations: E0308, E0605.
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For more information about an error, try `rustc --explain E0308`.
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