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new rustc_on_unimplemented match values #2801

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1 change: 1 addition & 0 deletions src/diagnostics.md
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Expand Up @@ -964,6 +964,7 @@ The compiler can provide several values to match on, for example:
- references to said slices and arrays.
- `"fn"`, `"unsafe fn"` or `"#[target_feature] fn"` when self is a function.
- `"{integer}"` and `"{float}"` if the type is a number but we haven't inferred it yet.
- `"{struct}"`, `"{enum}"` and `"{union}"` to match self as an ADT
- combinations of the above, like `"[{integral}; _]"`.

For example, the `Iterator` trait can be filtered in the following way:
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