diff options
Diffstat (limited to 'src/test/ui/impl-trait/dyn-trait-return-should-be-impl-trait.rs')
-rw-r--r-- | src/test/ui/impl-trait/dyn-trait-return-should-be-impl-trait.rs | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/dyn-trait-return-should-be-impl-trait.rs b/src/test/ui/impl-trait/dyn-trait-return-should-be-impl-trait.rs new file mode 100644 index 000000000..cbf1daabe --- /dev/null +++ b/src/test/ui/impl-trait/dyn-trait-return-should-be-impl-trait.rs @@ -0,0 +1,74 @@ +#![allow(bare_trait_objects)] +struct Struct; +trait Trait {} +impl Trait for Struct {} +impl Trait for u32 {} + +fn fuz() -> (usize, Trait) { (42, Struct) } +//~^ ERROR E0277 +//~| ERROR E0308 +fn bar() -> (usize, dyn Trait) { (42, Struct) } +//~^ ERROR E0277 +//~| ERROR E0308 +fn bap() -> Trait { Struct } +//~^ ERROR E0746 +fn ban() -> dyn Trait { Struct } +//~^ ERROR E0746 +fn bak() -> dyn Trait { unimplemented!() } //~ ERROR E0746 +// Suggest using `Box<dyn Trait>` +fn bal() -> dyn Trait { //~ ERROR E0746 + if true { + return Struct; + } + 42 +} +fn bax() -> dyn Trait { //~ ERROR E0746 + if true { + Struct + } else { + 42 //~ ERROR `if` and `else` have incompatible types + } +} +fn bam() -> Box<dyn Trait> { + if true { + return Struct; //~ ERROR mismatched types + } + 42 //~ ERROR mismatched types +} +fn baq() -> Box<dyn Trait> { + if true { + return 0; //~ ERROR mismatched types + } + 42 //~ ERROR mismatched types +} +fn baz() -> Box<dyn Trait> { + if true { + Struct //~ ERROR mismatched types + } else { + 42 //~ ERROR mismatched types + } +} +fn baw() -> Box<dyn Trait> { + if true { + 0 //~ ERROR mismatched types + } else { + 42 //~ ERROR mismatched types + } +} + +// Suggest using `impl Trait` +fn bat() -> dyn Trait { //~ ERROR E0746 + if true { + return 0; + } + 42 +} +fn bay() -> dyn Trait { //~ ERROR E0746 + if true { + 0 + } else { + 42 + } +} + +fn main() {} |