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"match arms have incompatible types" hint incorrect #63136

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bjorn3 opened this issue Jul 30, 2019 · 0 comments · Fixed by #63337
Closed

"match arms have incompatible types" hint incorrect #63136

bjorn3 opened this issue Jul 30, 2019 · 0 comments · Fixed by #63337
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A-diagnostics Area: Messages for errors, warnings, and lints C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@bjorn3
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bjorn3 commented Jul 30, 2019

this and all prior arms are found to be of type !

Only some of the prior arms are of type !, the rest is of type FloatCC.

error[E0308]: match arms have incompatible types
  --> src/llvm_intrinsics.rs:77:33
   |
60 |  /                     match scalar.assert_bits(Size::from_bytes(1)) {
61 |  |                         0 => FloatCC::Equal,
62 |  |                         1 => FloatCC::LessThan,
63 |  |                         2 => FloatCC::LessThanOrEqual,
...   |
74 |  |                         6 => {
   |  |______________________________-
75 | ||                             unimplemented!("not less than or equal");
76 | ||                         }
   | ||_________________________- this and all prior arms are found to be of type `!`
77 |  |                         kind => unreachable!("kind {:?}", kind),
   |  |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `cranelift_codegen::ir::condcodes::FloatCC`, found ()
78 |  |                     }
   |  |_____________________- `match` arms have incompatible types
   |
   = note: expected type `cranelift_codegen::ir::condcodes::FloatCC`
              found type `()`
@jonas-schievink jonas-schievink added A-diagnostics Area: Messages for errors, warnings, and lints C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jul 30, 2019
Centril added a commit to Centril/rust that referenced this issue Aug 9, 2019
Tweak mismatched types error

- Change expected/found for type mismatches in `break`
- Be more accurate when talking about diverging match arms
- Tweak wording of function without a return value
- Suggest calling bare functions when their return value can be coerced to the expected type
- Give more parsing errors when encountering `foo(_, _, _)`

Fix rust-lang#51767, fix rust-lang#62677, fix rust-lang#63136, cc rust-lang#37384, cc rust-lang#35241.
Centril added a commit to Centril/rust that referenced this issue Aug 9, 2019
Tweak mismatched types error

- Change expected/found for type mismatches in `break`
- Be more accurate when talking about diverging match arms
- Tweak wording of function without a return value
- Suggest calling bare functions when their return value can be coerced to the expected type
- Give more parsing errors when encountering `foo(_, _, _)`

Fix rust-lang#51767, fix rust-lang#62677, fix rust-lang#63136, cc rust-lang#37384, cc rust-lang#35241.
Centril added a commit to Centril/rust that referenced this issue Aug 9, 2019
Tweak mismatched types error

- Change expected/found for type mismatches in `break`
- Be more accurate when talking about diverging match arms
- Tweak wording of function without a return value
- Suggest calling bare functions when their return value can be coerced to the expected type
- Give more parsing errors when encountering `foo(_, _, _)`

Fix rust-lang#51767, fix rust-lang#62677, fix rust-lang#63136, cc rust-lang#37384, cc rust-lang#35241, cc rust-lang#51669.
Centril added a commit to Centril/rust that referenced this issue Aug 10, 2019
Tweak mismatched types error

- Change expected/found for type mismatches in `break`
- Be more accurate when talking about diverging match arms
- Tweak wording of function without a return value
- Suggest calling bare functions when their return value can be coerced to the expected type
- Give more parsing errors when encountering `foo(_, _, _)`

Fix rust-lang#51767, fix rust-lang#62677, fix rust-lang#63136, cc rust-lang#37384, cc rust-lang#35241, cc rust-lang#51669.
Centril added a commit to Centril/rust that referenced this issue Aug 10, 2019
Tweak mismatched types error

- Change expected/found for type mismatches in `break`
- Be more accurate when talking about diverging match arms
- Tweak wording of function without a return value
- Suggest calling bare functions when their return value can be coerced to the expected type
- Give more parsing errors when encountering `foo(_, _, _)`

Fix rust-lang#51767, fix rust-lang#62677, fix rust-lang#63136, cc rust-lang#37384, cc rust-lang#35241, cc rust-lang#51669.
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Labels
A-diagnostics Area: Messages for errors, warnings, and lints C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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