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Support the awful alt-else form in rustboot's cexp grammar, at least transiently. Remove in the future.

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This commit is contained in:
Graydon Hoare 2011-02-24 17:17:39 -08:00
parent dbf53b4c37
commit 88f0463c2b
1 changed files with 17 additions and 0 deletions
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17
src/comp/front/parser.rs
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@ -1170,6 +1170,23 @@ impure fn parse_alt_expr(parser p) -> @ast.expr {
auto block = parse_block(p);
arms += vec(rec(pat=pat, block=block, index=index));
}
// FIXME: this is a vestigial form left over from
// rustboot, we're keeping it here for source-compat
// for the time being but it should be flushed out
// once we've bootstrapped. When we see 'else {' here,
// we pretend we saw 'case (_) {'. It has the same
// meaning, and only exists due to the cexp/pexp split
// in rustboot, which we're not maintaining.
case (token.ELSE) {
p.bump();
auto hi = p.get_span();
auto pat = @spanned(lo, hi, ast.pat_wild(ast.ann_none));
auto index = index_arm(pat);
auto block = parse_block(p);
arms += vec(rec(pat=pat, block=block, index=index));
}
case (token.RBRACE) { /* empty */ }
case (?tok) {
p.err("expected 'case' or '}' when parsing 'alt' statement " +