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Explain type mismatch cause pointing to return type when it is impl Trait

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This commit is contained in:
Esteban Küber 2019-01-20 18:42:10 -08:00
parent e73069767f
commit e33f7f7de1
3 changed files with 39 additions and 9 deletions
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5
src/test/ui/impl-trait/equality.stderr
View file

@ -1,8 +1,11 @@
error[E0308]: mismatched types
--> $DIR/equality.rs:15:5
|
LL | fn two(x: bool) -> impl Foo {
| -------- expected because this return type...
LL | if x {
LL | return 1_i32;
| ----- expected because of this statement
| ----- ...is found to be `i32` here
LL | }
LL | 0_u32
| ^^^^^ expected i32, found u32

14
src/test/ui/point-to-type-err-cause-on-impl-trait-return.stderr
View file

@ -1,8 +1,11 @@
error[E0308]: mismatched types
--> $DIR/point-to-type-err-cause-on-impl-trait-return.rs:5:5
|
LL | fn foo() -> impl std::fmt::Display {
| ---------------------- expected because this return type...
LL | if false {
LL | return 0i32;
| ---- expected because of this statement
| ---- ...is found to be `i32` here
LL | }
LL | 1u32
| ^^^^ expected i32, found u32
@ -13,8 +16,11 @@ LL | 1u32
error[E0308]: mismatched types
--> $DIR/point-to-type-err-cause-on-impl-trait-return.rs:13:16
|
LL | fn bar() -> impl std::fmt::Display {
| ---------------------- expected because this return type...
LL | if false {
LL | return 0i32;
| ---- expected because of this statement
| ---- ...is found to be `i32` here
LL | } else {
LL | return 1u32;
| ^^^^ expected i32, found u32
@ -25,10 +31,12 @@ LL | return 1u32;
error[E0308]: mismatched types
--> $DIR/point-to-type-err-cause-on-impl-trait-return.rs:19:5
|
LL | fn baz() -> impl std::fmt::Display {
| ---------------------- expected because this return type...
LL | / if false {
LL | | //~^ ERROR mismatched types
LL | | return 0i32;
| | ---- expected because of this statement
| | ---- ...is found to be `i32` here
LL | | } else {
LL | | 1u32
LL | | }