Add more tests for mismatched Option/Result return types.
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@ -23,6 +23,21 @@ fn b() -> Result<(), ()> {
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//~| HELP try adding an expression
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//~| HELP try adding an expression
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}
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}
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fn c() -> Option<()> {
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for _ in [1, 2] {
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//~^ ERROR mismatched types
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f();
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}
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//~^ HELP try adding an expression
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}
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fn d() -> Option<()> {
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c()?
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//~^ ERROR incompatible types
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//~| HELP try removing this `?`
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//~| HELP try adding an expression
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}
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fn main() {
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fn main() {
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let _: Option<()> = while false {};
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let _: Option<()> = while false {};
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//~^ ERROR mismatched types
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//~^ ERROR mismatched types
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@ -37,7 +37,52 @@ LL + Ok(())
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error[E0308]: mismatched types
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error[E0308]: mismatched types
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--> $DIR/compatible-variants.rs:27:25
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--> $DIR/compatible-variants.rs:27:5
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LL | fn c() -> Option<()> {
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| ---------- expected `Option<()>` because of return type
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LL | / for _ in [1, 2] {
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LL | |
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LL | | f();
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LL | | }
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| |_____^ expected enum `Option`, found `()`
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= note: expected enum `Option<()>`
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found unit type `()`
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help: try adding an expression at the end of the block
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LL ~ }
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LL + None
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LL ~ }
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LL + Some(())
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error[E0308]: `?` operator has incompatible types
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--> $DIR/compatible-variants.rs:35:5
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LL | c()?
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| ^^^^ expected enum `Option`, found `()`
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= note: `?` operator cannot convert from `()` to `Option<()>`
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= note: expected enum `Option<()>`
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found unit type `()`
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help: try removing this `?`
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LL - c()?
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LL + c()
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help: try adding an expression at the end of the block
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LL ~ c()?;
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LL + None
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LL ~ c()?;
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LL + Some(())
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error[E0308]: mismatched types
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--> $DIR/compatible-variants.rs:42:25
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LL | let _: Option<()> = while false {};
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LL | let _: Option<()> = while false {};
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| ---------- ^^^^^^^^^^^^^^ expected enum `Option`, found `()`
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| ---------- ^^^^^^^^^^^^^^ expected enum `Option`, found `()`
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@ -52,7 +97,7 @@ LL | let _: Option<()> = Some(while false {});
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| +++++ +
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| +++++ +
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error[E0308]: mismatched types
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error[E0308]: mismatched types
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--> $DIR/compatible-variants.rs:31:9
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--> $DIR/compatible-variants.rs:46:9
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LL | while false {}
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LL | while false {}
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| ^^^^^^^^^^^^^^ expected enum `Option`, found `()`
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| ^^^^^^^^^^^^^^ expected enum `Option`, found `()`
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@ -69,7 +114,7 @@ LL + Some(())
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error[E0308]: mismatched types
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error[E0308]: mismatched types
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--> $DIR/compatible-variants.rs:35:31
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--> $DIR/compatible-variants.rs:50:31
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LL | let _: Result<i32, i32> = 1;
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LL | let _: Result<i32, i32> = 1;
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| ---------------- ^ expected enum `Result`, found integer
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| ---------------- ^ expected enum `Result`, found integer
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@ -86,7 +131,7 @@ LL | let _: Result<i32, i32> = Err(1);
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| ++++ +
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| ++++ +
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error[E0308]: mismatched types
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error[E0308]: mismatched types
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--> $DIR/compatible-variants.rs:38:26
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--> $DIR/compatible-variants.rs:53:26
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LL | let _: Option<i32> = 1;
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LL | let _: Option<i32> = 1;
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| ----------- ^ expected enum `Option`, found integer
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| ----------- ^ expected enum `Option`, found integer
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@ -101,7 +146,7 @@ LL | let _: Option<i32> = Some(1);
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| +++++ +
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| +++++ +
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error[E0308]: mismatched types
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error[E0308]: mismatched types
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--> $DIR/compatible-variants.rs:41:28
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--> $DIR/compatible-variants.rs:56:28
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LL | let _: Hey<i32, i32> = 1;
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LL | let _: Hey<i32, i32> = 1;
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| ------------- ^ expected enum `Hey`, found integer
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| ------------- ^ expected enum `Hey`, found integer
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@ -118,7 +163,7 @@ LL | let _: Hey<i32, i32> = Hey::B(1);
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| +++++++ +
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| +++++++ +
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error[E0308]: mismatched types
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error[E0308]: mismatched types
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--> $DIR/compatible-variants.rs:44:29
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--> $DIR/compatible-variants.rs:59:29
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LL | let _: Hey<i32, bool> = false;
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LL | let _: Hey<i32, bool> = false;
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| -------------- ^^^^^ expected enum `Hey`, found `bool`
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| -------------- ^^^^^ expected enum `Hey`, found `bool`
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@ -133,7 +178,7 @@ LL | let _: Hey<i32, bool> = Hey::B(false);
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| +++++++ +
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| +++++++ +
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error[E0308]: mismatched types
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error[E0308]: mismatched types
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--> $DIR/compatible-variants.rs:48:19
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--> $DIR/compatible-variants.rs:63:19
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LL | let _ = Foo { bar };
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LL | let _ = Foo { bar };
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| ^^^ expected enum `Option`, found `i32`
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| ^^^ expected enum `Option`, found `i32`
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@ -145,6 +190,6 @@ help: try wrapping the expression in `Some`
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LL | let _ = Foo { bar: Some(bar) };
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LL | let _ = Foo { bar: Some(bar) };
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| ++++++++++ +
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| ++++++++++ +
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error: aborting due to 9 previous errors
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error: aborting due to 11 previous errors
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For more information about this error, try `rustc --explain E0308`.
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For more information about this error, try `rustc --explain E0308`.
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