Jonas Schievink f66af28641 Rollup merge of #79016 - fanzier:underscore-expressions, r=petrochenkov ... Make `_` an expression, to discard values in destructuring assignments This is the third and final step towards implementing destructuring assignment (RFC: rust-lang/rfcs#2909, tracking issue: #71126). This PR is the third and final part of #71156, which was split up to allow for easier review. With this PR, an underscore `_` is parsed as an expression but is allowed *only* on the left-hand side of a destructuring assignment. There it simply discards a value, similarly to the wildcard `_` in patterns. For instance, ```rust (a, _) = (1, 2) ``` will simply assign 1 to `a` and discard the 2. Note that for consistency, ``` _ = foo ``` is also allowed and equivalent to just `foo`. Thanks to ````@varkor```` who helped with the implementation, particularly around pre-expansion gating. r? ````@petrochenkov````		2020-11-15 13:39:48 +01:00
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src	Rollup merge of #79016 - fanzier:underscore-expressions, r=petrochenkov	2020-11-15 13:39:48 +01:00
Cargo.toml	mv compiler to compiler/	2020-08-30 18:45:07 +03:00