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Rollup merge of #68454 - GuillaumeGomez:clean-up-e0214, r=Dylan-DPC
clean up E0214 explanation r? @Dylan-DPC
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A generic type was described using parentheses rather than angle brackets.
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For example:
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Erroneous code example:
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```compile_fail,E0214
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fn main() {
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let v: Vec(&str) = vec!["foo"];
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}
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let v: Vec(&str) = vec!["foo"];
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```
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This is not currently supported: `v` should be defined as `Vec<&str>`.
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Parentheses are currently only used with generic types when defining parameters
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for `Fn`-family traits.
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The previous code example fixed:
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```
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let v: Vec<&str> = vec!["foo"];
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```
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