Rollup merge of #79851 - camelid:better-error-for-default-fn, r=davidtwco
Clarify the 'default is only allowed on...' error Code like impl Foo { default fn foo() {} } will trigger the error error: `default` is only allowed on items in `impl` definitions --> src/lib.rs:5:5 | 5 | default fn foo() {} | -------^^^^^^^^^ | | | `default` because of this but that's very confusing! I *did* put it on an item in an impl! So this commit changes the message to error: `default` is only allowed on items in trait impls --> src/lib.rs:5:5 | 5 | default fn foo() {} | -------^^^^^^^^^ | | | `default` because of this
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