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Auto merge of #40565 - estebank:binops-help, r=arielb1

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Explicit help message for binop type mismatch

When trying to do `1 + Some(2)`, or some other binary operation on two
types different types without an appropriate trait implementation, provide
an explicit help message:

```rust
help: `{integer} + std::option::Option<{integer}>` has no implementation
```

Re: #39579, #38564, #37626, #39942, #34698.
This commit is contained in:
bors 2017-04-10 21:56:13 +00:00
commit 730e5ad04e
8 changed files with 164 additions and 17 deletions
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6
src/test/ui/span/multiline-span-simple.stderr
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@ -9,11 +9,7 @@ error[E0277]: the trait bound `u32: std::ops::Add<()>` is not satisfied
27 | | y),
| |______________^ ...ending here: the trait `std::ops::Add<()>` is not implemented for `u32`
|
= help: the following implementations were found:
<u32 as std::ops::Add>
<&'a u32 as std::ops::Add<u32>>
<u32 as std::ops::Add<&'a u32>>
<&'b u32 as std::ops::Add<&'a u32>>
= note: no implementation for `u32 + ()`
error: aborting due to previous error