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Allow the expansion of old-style expr macros in stmt position.

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Paul Stansifer 2012-11-19 00:30:48 -05:00 committed by Graydon Hoare
parent b7fcc9b52e
commit ba354b1726
1 changed files with 18 additions and 0 deletions
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18
src/libsyntax/ext/expand.rs
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@ -303,6 +303,24 @@ fn expand_stmt(exts: HashMap<~str, syntax_extension>, cx: ext_ctxt,
return (fully_expanded, sp)
}
Some(normal({expander: exp, span: exp_sp})) => {
//convert the new-style invoc for the old-style macro
let arg = base::tt_args_to_original_flavor(cx, pth.span, tts);
let exp_expr = exp(cx, mac.span, arg, None);
let expanded = @{node: ast::stmt_expr(exp_expr, cx.next_id()),
span: exp_expr.span};
cx.bt_push(ExpandedFrom({call_site: sp,
callie: {name: *extname,
span: exp_sp}}));
//keep going, outside-in
let fully_expanded = fld.fold_stmt(expanded).node;
cx.bt_pop();
(fully_expanded, sp)
}
_ => {
cx.span_fatal(pth.span,
fmt!("'%s' is not a tt-style macro",