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ad23f30b1d
Pretty print `Fn<(..., ...)>` trait refs with parentheses (almost) always It's almost always better, at least in diagnostics, to print `Fn(i32, u32)` instead of `Fn<(i32, u32)>`. Related to but doesn't fix #118225. That needs a separate fix.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.