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e7ed8443ea
Improve diagnostics for `const a: = expr;` Adds a suggestion to write a type when there is a colon, but the type is not present. I've also shrunk spans a little, so the suggestions are a little nicer. Resolves #100146 r? `@compiler-errors`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.