feat: Refactor path lowering and serve a new path diagnostic #19127
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…ys take a `GenericDefId`
Lifetimes are elided in function signatures, and inferred in bodies.
And add a new diagnostic for non-`Fn` parenthesized generic args. Path lowering started to look like a mess, with each function carrying additional parameters for the diagnostic callback (since paths can occur both in type and in expression/pattern position, and their diagnostic handling is different) and the segment index, for the diagnostics report. So I refactored it from stateless functions on `TyLoweringContext` into stateful struct, `PathLoweringContext`, that tracks the process of lowering a path from resolution til assoc types selection.
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For non-
Fnparenthesized generic args (each time, I plan working on the diagnostic from #17590, then I discover that ty lowering needs another refactor so I proceed with a refactor and a trivial diagnostic to test it. But this time I believe is the last :) ).Path lowering started to look like a mess, with each function carrying additional parameters for the diagnostic callback (since paths can occur both in type and in expression/pattern position, and their diagnostic handling is different) and the segment index, for the diagnostics report. So I refactored it from stateless functions on
TyLoweringContextinto stateful struct,PathLoweringContext, that tracks the process of lowering a path from resolution til assoc types selection.(I really hope I'm not making @jackh726's work on the new trait solver a nightmare. Sorry!)