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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
View file

@ -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)
};

4
src/libsyntax/parse/token.rs
View file

@ -704,8 +704,8 @@ pub fn is_reserved_keyword(tok: &Token) -> bool {
pub fn mtwt_token_eq(t1 : &Token, t2 : &Token) -> bool {
match (t1,t2) {
(&IDENT(id1,_),&IDENT(id2,_)) =>
ast_util::mtwt_resolve(id1) == ast_util::mtwt_resolve(id2),
(&IDENT(id1,_),&IDENT(id2,_)) | (&LIFETIME(id1),&LIFETIME(id2)) =>
ast_util::mtwt_resolve(id1) == ast_util::mtwt_resolve(id2),
_ => *t1 == *t2
}
}