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A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lintsA-impl-traitArea: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.D-confusingDiagnostics: Confusing error or lint that should be reworked.Diagnostics: Confusing error or lint that should be reworked.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.
Description
Given a function specified as returning a composite type that incorrectly returns an object with an inner type mismatch, the compiler reports the error as being in the function return type declaration rather than at the point the incorrect item is returned.
A sample git repo can be found here: https://git.neosmart.net/mqudsi/futuretest/src/rust-46644
The code in question:
fn create_future() -> impl Future<Item=(), Error=()> {
return future::ok(Ok(()));
}
The compiler returns the following;
Compiling futuretest v0.1.0 (file:///mnt/d/GIT/futuretest)
error[E0271]: type mismatch resolving `<futures::FutureResult<std::result::Result<(), _>, ()> as futures::Future>::Item == ()`
--> src/main.rs:17:23
|
17 | fn create_future() -> impl Future<Item=(), Error=()> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found ()
|
= note: expected type `std::result::Result<(), _>`
found type `()`
= note: the return type of a function must have a statically known size
error: aborting due to previous error
error: Could not compile `futuretest`.
To learn more, run the command again with --verbose.
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A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lintsA-impl-traitArea: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.D-confusingDiagnostics: Confusing error or lint that should be reworked.Diagnostics: Confusing error or lint that should be reworked.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.