Clearer Error Message for Duplicate Definition
Clearer use of the error message and span labels to communicate duplicaiton defitions/imports. New error format: ``` error[E0428]: the name `Foo` is defined twice --> example.rs:2:1 | 1 | trait Foo { } | ------------- previous definition of the trait `Foo` here 2 | struct Foo { } | ^^^^^^^^^^^^^^ `Foo` redefined here = note: `Foo` must be defined only once in the type namespace of this module error: aborting due to previous error ```
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