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Make break and continue hygienic

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Makes labelled loops hygiene by performing renaming of the labels
defined in e.g. `'x: loop { ... }` and then used in break and continue
statements within loop body so that they act hygienically when used with
macros.

Closes #12262.
This commit is contained in:
Edward Wang
2014-02-15 16:54:32 +08:00
parent 551da06157
commit 386db05df8
18 changed files with 262 additions and 28 deletions
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6
src/libsyntax/parse/parser.rs
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@@ -1822,7 +1822,7 @@ impl Parser {
let ex = if Parser::token_is_lifetime(&self.token) {
let lifetime = self.get_lifetime();
self.bump();
ExprAgain(Some(lifetime.name))
ExprAgain(Some(lifetime))
} else {
ExprAgain(None)
};
@@ -1885,7 +1885,7 @@ impl Parser {
if Parser::token_is_lifetime(&self.token) {
let lifetime = self.get_lifetime();
self.bump();
ex = ExprBreak(Some(lifetime.name));
ex = ExprBreak(Some(lifetime));
} else {
ex = ExprBreak(None);
}
@@ -2579,7 +2579,7 @@ impl Parser {
let ex = if Parser::token_is_lifetime(&self.token) {
let lifetime = self.get_lifetime();
self.bump();
ExprAgain(Some(lifetime.name))
ExprAgain(Some(lifetime))
} else {
ExprAgain(None)
};