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Parse and accept type equality constraints in where clauses #20041

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Parse and accept type equality constraints in where clauses#20041

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@jroesch

jroesch
openedon Dec 19, 2014

Implement the missing type equality constraint specified in RFC 135.

Examples

fn sum<I: Iterator>(_: I) -> i32
where
    I::Item == i32 // or `I::Item = i32`
{
    // ...    
}
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    A-lazy-normalizationArea: Lazy normalization (tracking issue: #60471)A-typesystemArea: The type systemC-tracking-issueCategory: A tracking issue for an RFC or an unstable feature.S-tracking-design-concernsStatus: There are blocking ❌ design concerns.S-tracking-unimplementedStatus: The feature has not been implemented.T-langRelevant to the language team, which will review and decide on the PR/issue.T-typesRelevant to the types team, which will review and decide on the PR/issue.

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