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don't expand subexprs of for loop, just re-expand whole thing.

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Fixes #15167
This commit is contained in:
John Clements 2014-06-24 17:58:56 -07:00
parent d2adb7cf81
commit 1e329bf050
1 changed files with 6 additions and 5 deletions
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11
src/libsyntax/ext/expand.rs
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@ -132,8 +132,6 @@ pub fn expand_expr(e: Gc<ast::Expr>, fld: &mut MacroExpander) -> Gc<ast::Expr> {
ast::ExprForLoop(src_pat, src_expr, src_loop_block, opt_ident) => {
// Expand any interior macros etc.
// NB: we don't fold pats yet. Curious.
let src_expr = fld.fold_expr(src_expr).clone();
let (src_loop_block, opt_ident) = expand_loop_block(src_loop_block, opt_ident, fld);
let span = e.span;
@ -143,7 +141,7 @@ pub fn expand_expr(e: Gc<ast::Expr>, fld: &mut MacroExpander) -> Gc<ast::Expr> {
// i => {
// ['<ident>:] loop {
// match i.next() {
// None => break,
// None => break ['<ident>],
// Some(mut value) => {
// let <src_pat> = value;
// <src_loop_block>
@ -163,7 +161,7 @@ pub fn expand_expr(e: Gc<ast::Expr>, fld: &mut MacroExpander) -> Gc<ast::Expr> {
let local_path = fld.cx.path_ident(span, local_ident);
let some_path = fld.cx.path_ident(span, fld.cx.ident_of("Some"));
// `None => break ['<ident>];`
// `None => break ['<ident>],`
let none_arm = {
let break_expr = fld.cx.expr(span, ast::ExprBreak(opt_ident));
let none_pat = fld.cx.pat_ident(span, none_ident);
@ -222,7 +220,9 @@ pub fn expand_expr(e: Gc<ast::Expr>, fld: &mut MacroExpander) -> Gc<ast::Expr> {
let discrim = fld.cx.expr_mut_addr_of(span, src_expr);
let i_pattern = fld.cx.pat_ident(span, local_ident);
let arm = fld.cx.arm(span, vec!(i_pattern), loop_expr);
fld.cx.expr_match(span, discrim, vec!(arm))
// why these clone()'s everywhere? I guess I'll follow the pattern....
let match_expr = fld.cx.expr_match(span, discrim, vec!(arm));
fld.fold_expr(match_expr).clone()
}
ast::ExprLoop(loop_block, opt_ident) => {
@ -1248,6 +1248,7 @@ mod test {
// FIXME #9384, match variable hygiene. Should expand into
// fn z() {match 8 {x_1 => {match 9 {x_2 | x_2 => x_2 + x_1}}}}
#[ignore]
#[test] fn issue_9384(){
run_renaming_test(
&("macro_rules! bad_macro (($ex:expr) => ({match 9 {x | x => x + $ex}}))