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Auto merge of #53815 - F001:if-let-guard, r=petrochenkov

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refactor match guard

This is the first step to implement RFC 2294: if-let-guard. Tracking issue: https://github.com/rust-lang/rust/issues/51114

The second step should be introducing another variant `IfLet` in the Guard enum. I separated them into 2 PRs for the convenience of reviewers.

r? @petrochenkov
This commit is contained in:
bors
2018-09-01 20:31:29 +00:00
parent f39f218ec3 7a083ca25f
commit 28bcffead7
22 changed files with 115 additions and 35 deletions
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12
src/libsyntax/print/pprust.rs
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@@ -2702,10 +2702,14 @@ impl<'a> State<'a> {
self.print_outer_attributes(&arm.attrs)?;
self.print_pats(&arm.pats)?;
self.s.space()?;
if let Some(ref e) = arm.guard {
self.word_space("if")?;
self.print_expr(e)?;
self.s.space()?;
if let Some(ref g) = arm.guard {
match g {
ast::Guard::If(ref e) => {
self.word_space("if")?;
self.print_expr(e)?;
self.s.space()?;
}
}
}
self.word_space("=>")?;