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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
|
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.
91 lines
3.3 KiB
Plaintext
91 lines
3.3 KiB
Plaintext
error[E0308]: `if` and `else` have incompatible types
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--> $DIR/fn-pointer-mismatch.rs:11:43
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LL | let g = if n % 2 == 0 { &foo } else { &bar };
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| ---- ^^^^ expected `&fn(u32) -> u32 {foo}`, found `&fn(u32) -> u32 {bar}`
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| expected because of this
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= note: expected reference `&fn(_) -> _ {foo}`
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found reference `&fn(_) -> _ {bar}`
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= note: different fn items have unique types, even if their signatures are the same
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= help: consider casting both fn items to fn pointers using `as fn(u32) -> u32`
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error[E0308]: mismatched types
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--> $DIR/fn-pointer-mismatch.rs:23:9
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LL | let mut a = foo;
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| --- expected due to this value
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LL | a = bar;
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| ^^^ expected fn item, found a different fn item
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= note: expected fn item `fn(_) -> _ {foo}`
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found fn item `fn(_) -> _ {bar}`
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= note: different fn items have unique types, even if their signatures are the same
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= help: consider casting both fn items to fn pointers using `as fn(u32) -> u32`
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error[E0308]: mismatched types
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--> $DIR/fn-pointer-mismatch.rs:31:18
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LL | b = Box::new(bar);
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| -------- ^^^ expected fn item, found a different fn item
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| |
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| arguments to this function are incorrect
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= note: expected fn item `fn(_) -> _ {foo}`
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found fn item `fn(_) -> _ {bar}`
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= note: different fn items have unique types, even if their signatures are the same
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note: associated function defined here
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--> $SRC_DIR/alloc/src/boxed.rs:LL:COL
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= help: consider casting both fn items to fn pointers using `as fn(u32) -> u32`
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error[E0308]: mismatched types
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--> $DIR/fn-pointer-mismatch.rs:36:29
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LL | let c: fn(u32) -> u32 = &foo;
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| -------------- ^^^^ expected fn pointer, found `&fn(u32) -> u32 {foo}`
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| |
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| expected due to this
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= note: expected fn pointer `fn(_) -> _`
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found reference `&fn(_) -> _ {foo}`
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help: consider removing the reference
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LL | let c: fn(u32) -> u32 = foo;
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| ~~~
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error[E0308]: mismatched types
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--> $DIR/fn-pointer-mismatch.rs:42:30
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LL | let d: &fn(u32) -> u32 = foo;
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| --------------- ^^^ expected `&fn(u32) -> u32`, found fn item
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| |
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| expected due to this
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= note: expected reference `&fn(_) -> _`
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found fn item `fn(_) -> _ {foo}`
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help: consider using a reference
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LL | let d: &fn(u32) -> u32 = &foo;
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| +
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error[E0308]: mismatched types
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--> $DIR/fn-pointer-mismatch.rs:48:30
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LL | let e: &fn(u32) -> u32 = &foo;
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| --------------- ^^^^ expected `&fn(u32) -> u32`, found `&fn(u32) -> u32 {foo}`
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| |
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| expected due to this
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= note: expected reference `&fn(_) -> _`
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found reference `&fn(_) -> _ {foo}`
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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 e: &fn(u32) -> u32 = &(foo as fn(u32) -> u32);
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| ~~~~~~~~~~~~~~~~~~~~~~~~
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error: aborting due to 6 previous errors
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For more information about this error, try `rustc --explain E0308`.
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