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Allow use of [_ ; n] syntax for fixed length and repeating arrays.

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This does NOT break any existing programs because the `[_, ..n]` syntax is also supported.
This commit is contained in:
Nick Cameron
2014-12-20 15:20:51 +13:00
parent cbe9fb45bc
commit 2e86929a4a
122 changed files with 260 additions and 266 deletions
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11
src/libsyntax/parse/parser.rs
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@@ -1548,7 +1548,7 @@ impl<'a> Parser<'a> {
self.expect(&token::OpenDelim(token::Bracket));
let t = self.parse_ty_sum();
// Parse the `, ..e` in `[ int, ..e ]`
// Parse the `; e` in `[ int; e ]`
// where `e` is a const expression
let t = match self.maybe_parse_fixed_vstore() {
None => TyVec(t),
@@ -1716,6 +1716,9 @@ impl<'a> Parser<'a> {
self.bump();
self.bump();
Some(self.parse_expr())
} else if self.check(&token::Semi) {
self.bump();
Some(self.parse_expr())
} else {
None
}
@@ -2262,6 +2265,12 @@ impl<'a> Parser<'a> {
let count = self.parse_expr();
self.expect(&token::CloseDelim(token::Bracket));
ex = ExprRepeat(first_expr, count);
} else if self.check(&token::Semi) {
// Repeating vector syntax: [ 0; 512 ]
self.bump();
let count = self.parse_expr();
self.expect(&token::CloseDelim(token::Bracket));
ex = ExprRepeat(first_expr, count);
} else if self.check(&token::Comma) {
// Vector with two or more elements.
self.bump();