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with the corresponding trait parameter bounds. This is a version of the patch in PR #12611 by Florian Hahn, modified to address Niko's feedback. It does not address the issue of duplicate type parameter bounds, nor does it address the issue of implementation-defined methods that contain *fewer* bounds than the trait, because Niko's review indicates that this should not be necessary (and indeed I believe it is not). A test has been added to ensure that this works. This will break code like: trait Foo { fn bar<T:Baz>(); } impl Foo for Boo { fn bar<T:Baz + Quux>() { ... } // ^~~~ ERROR } This will be rejected because the implementation requires *more* bounds than the trait. It can be fixed by either adding the missing bound to the trait: trait Foo { fn bar<T:Baz + Quux>(); // ^~~~ } impl Foo for Boo { fn bar<T:Baz + Quux>() { ... } // OK } Or by removing the bound from the impl: trait Foo { fn bar<T:Baz>(); } impl Foo for Boo { fn bar<T:Baz>() { ... } // OK // ^ remove Quux } This patch imports the relevant tests from #2687, as well as the test case in #5886, which is fixed as well by this patch. Closes #2687. Closes #5886. [breaking-change] r? @pnkfelix |
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