clean up E0468 explanation
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@ -1,4 +1,4 @@
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A non-root module attempts to import macros from another crate.
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A non-root module tried to import macros from another crate.
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Example of erroneous code:
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@ -17,7 +17,7 @@ Either move the macro import to crate root or do without the foreign macros.
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This will work:
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```
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#[macro_use(debug_assert)]
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#[macro_use(debug_assert)] // ok!
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extern crate core;
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mod foo {
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