Implement destructuring assignment#71156

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fanzier wants to merge 28 commits intorust-lang:masterfrom

fanzier:destructuring-assignment

Commits on Nov 4, 2020

Add `destructuring_assignment` feature gate

varkor
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fanzier
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Allow recursive tuples on the LHS of assignments
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Handle slices and structs as well
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Handle `..` except in structs
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Fix tidy
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Handle ordinary assignments as before
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Only lower tuple structs if in fact a constructor
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Disallow `.. rest` in struct on LHS of an assignment
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Check for constructors in early return condition
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Add tests
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Allow `_` as an expression
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Allow `_` on the LHS of an assignment to discard a value
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Allow `..` in struct expressions on the LHS of assignments
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Improve error message for struct expression missing a base expression after `..`
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Adjust comments and diagnostics

varkor
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fanzier
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Update feature gate issue

varkor
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Support `(..)`

varkor
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Add more complex example

varkor
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Fix tests
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Fix handling of rest without base in LHS

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Add additional tests for trailing `..`

varkor
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Add pre-expansion gating

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fanzier
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Make pre-expansion gate slightly less obnoxious

varkor
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fanzier
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Fix ui-fulldeps test

varkor
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fanzier
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Fix rebase issues

varkor
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fanzier
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Add support for `StructRest` in clippy

varkor
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fanzier
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Prevent default match bindings in destructuring assignment

varkor
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fanzier
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Fix rebase issue and test
fanzier
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