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... and fix a small bug revealed by that.
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982: Implement BindingMode for pattern matching. r=flodiebold a=mjkillough
Implement `BindingMode` for pattern matching, so that types can be
correctly inferred using match ergonomics. The binding mode defaults to
`Move` (referred to as 'BindingMode::BindByValue` in rustc), and is
updated by automatic dereferencing of the value being matched.
Fixes #888.
- [Binding modes in The Reference](https://doc.rust-lang.org/reference/patterns.html#binding-modes)
- [`rustc` implementation](https://github.com/rust-lang/rust/blob/e17c48e2f21eefd59748e364234efc7037a3ec96/src/librustc_typeck/check/_match.rs#L77) (and [definition of `BindingMode`](https://github.com/rust-lang/rust/blob/e957ed9d10ec589bdd523b88b4b44c41b1ecf763/src/librustc/ty/binding.rs))
- [Match Ergonomics RFC](https://github.com/rust-lang/rfcs/blob/master/text/2005-match-ergonomics.md#binding-mode-rules)
Co-authored-by: Michael Killough <[email protected]>
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This decouples callers from knowing what the default binding mode of
pattern matching is.
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Implement `BindingMode` for pattern matching, so that types can be
correctly inferred using match ergonomics. The binding mode defaults to
`Move` (referred to as 'BindingMode::BindByValue` in rustc), and is
updated by automatic dereferencing of the value being matched.
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It doesn't need to be in there since it's just information from the def. Another
step towards aligning Ty with Chalk's representation.
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It was just getting too big. We now have:
- ty: the `Ty` enum and helpers
- ty::infer: actual type inference
- ty::lower: lowering from HIR to `Ty`
- ty::op: helpers for binary operations, currently
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