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Consider param-env for sizedness fast path #143309
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,16 +1,33 @@ | ||
error[E0412]: cannot find type `UUU` in this scope | ||
--> $DIR/ignore-err-clauses.rs:7:5 | ||
--> $DIR/ignore-err-clauses.rs:6:5 | ||
| | ||
LL | UUU: Copy, | ||
| ^^^ not found in this scope | ||
|
||
error[E0282]: type annotations needed | ||
--> $DIR/ignore-err-clauses.rs:3:14 | ||
error[E0382]: use of moved value: `x` | ||
--> $DIR/ignore-err-clauses.rs:9:9 | ||
| | ||
LL | fn dbl<T>(x: T) -> <T as Add>::Output | ||
| ^ cannot infer type for type parameter `T` | ||
| - move occurs because `x` has type `T`, which does not implement the `Copy` trait | ||
... | ||
LL | x + x | ||
| ----^ | ||
| | | | ||
| | value used here after move | ||
| `x` moved due to usage in operator | ||
| | ||
help: if `T` implemented `Clone`, you could clone the value | ||
--> $DIR/ignore-err-clauses.rs:3:8 | ||
| | ||
LL | fn dbl<T>(x: T) -> <T as Add>::Output | ||
| ^ consider constraining this type parameter with `Clone` | ||
... | ||
LL | x + x | ||
| - you could clone this value | ||
note: calling this operator moves the left-hand side | ||
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL | ||
|
||
error: aborting due to 2 previous errors | ||
|
||
Some errors have detailed explanations: E0282, E0412. | ||
For more information about an error, try `rustc --explain E0282`. | ||
Some errors have detailed explanations: E0382, E0412. | ||
For more information about an error, try `rustc --explain E0382`. |
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This used to stall on an ambiguous
T: Sized
because the param-env hadT: Sized, {type error}: Sized
and both matched. I'm not worried about the incompleteness we're introducing here, since there's nothing wrong with always preferring the non-error candidate.