On return type impl Trait for block with no expr point at last semi#58204
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bors merged 3 commits intorust-lang:masterfrom Mar 9, 2019
Merged
On return type impl Trait for block with no expr point at last semi#58204bors merged 3 commits intorust-lang:masterfrom
impl Trait for block with no expr point at last semi#58204bors merged 3 commits intorust-lang:masterfrom
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r? @eddyb (rust_highfive has picked a reviewer for you, use r? to override) |
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cc @cramertj |
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Nice! This looks like a great improvement. |
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r? @zackmdavis |
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requested reference comment; otherwise, r=me
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@bors r=zackmdavis |
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On return type `impl Trait` for block with no expr point at last semi
Partial solution, doesn't actually validate that the last statement in the function body can satisfy the trait bound, but it's a good incremental improvement over the status quo.
```
error[E0277]: the trait bound `(): Bar` is not satisfied
--> $DIR/impl-trait-return-trailing-semicolon.rs:3:13
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LL | fn foo() -> impl Bar {
| ^^^^^^^^ the trait `Bar` is not implemented for `()`
LL | 5;
| - consider removing this semicolon
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= note: the return type of a function must have a statically known size
```
Partially addresses rust-lang#54771.
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Failed in rollup (#58426 (comment)) due to combination with #58167. @bors r- |
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Ping from triage @estebank, any thoughts on moving forward? |
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@Centril I'll fix this soon |
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@bors rollup |
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On return type `impl Trait` for block with no expr point at last semi
Partial solution, doesn't actually validate that the last statement in the function body can satisfy the trait bound, but it's a good incremental improvement over the status quo.
```
error[E0277]: the trait bound `(): Bar` is not satisfied
--> $DIR/impl-trait-return-trailing-semicolon.rs:3:13
|
LL | fn foo() -> impl Bar {
| ^^^^^^^^ the trait `Bar` is not implemented for `()`
LL | 5;
| - consider removing this semicolon
|
= note: the return type of a function must have a statically known size
```
Partially addresses rust-lang#54771.
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Rollup of 24 pull requests Successful merges: - #58080 (Add FreeBSD armv6 and armv7 targets) - #58204 (On return type `impl Trait` for block with no expr point at last semi) - #58269 (Add librustc and libsyntax to rust-src distribution.) - #58369 (Make the Entry API of HashMap<K, V> Sync and Send) - #58861 (Expand where negative supertrait specific error is shown) - #58877 (Suggest removal of `&` when borrowing macro and appropriate) - #58883 (Suggest appropriate code for unused field when destructuring pattern) - #58891 (Remove stray ` in the docs for the FromIterator implementation for Option) - #58893 (race condition in thread local storage example) - #58906 (Monomorphize generator field types for debuginfo) - #58911 (Regression test for #58435.) - #58912 (Regression test for #58813) - #58916 (Fix release note problems noticed after merging.) - #58918 (Regression test added for an async ICE.) - #58921 (Add an explicit test for issue #50582) - #58926 (Make the lifetime parameters of tcx consistent.) - #58931 (Elide invalid method receiver error when it contains TyErr) - #58940 (Remove JSBackend from config.toml) - #58950 (Add self to mailmap) - #58961 (On incorrect cfg literal/identifier, point at the right span) - #58963 (libstd: implement Error::source for io::Error) - #58970 (delay_span_bug in wfcheck's ty.lift_to_tcx unwrap) - #58984 (Teach `-Z treat-err-as-bug` to take a number of errors to emit) - #59007 (Add a test for invalid const arguments) Failed merges: - #58959 (Add release notes for PR #56243) r? @ghost
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Partial solution, doesn't actually validate that the last statement in the function body can satisfy the trait bound, but it's a good incremental improvement over the status quo.
Partially addresses #54771.