Account for common `impl Trait`/`dyn Trait` return type errors - #68195

Merged

bors merged 15 commits into

rust-lang:masterfrom

estebank:impl-trait-2000

Jan 17, 2020

Commits on Jan 16, 2020

Specific error for unsized `dyn Trait` return type
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6fd5641
Account for diverging types in return `impl Trait`
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75eabb1
Elide E0308 errors in favor of E0746
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ea7e885
Make `impl Trait` suggestion in E0746 `MachineApplicable`
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b4bbe78
When trait bounds are missing for return values, point at them
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e1dd8a9
fmt
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93293c5
Add E0746 explanation to the index
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4c13d25
Split `librustc/traits/error_reporting.rs`
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00c8272
fix error code index comment
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4a75ef9
review comments
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5b36c18
review comments
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509cb33
Fix error index test
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c305ac3
review comments
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d7a6212
Account for object safety when suggesting `Box<dyn Trait>`
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00e2626
review comments
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029a9c6