rust/src/libsyntax/ext/concat_idents.rs

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import base::*;
fn expand_syntax_ext(cx: ext_ctxt, sp: codemap::span, arg: ast::mac_arg,
_body: ast::mac_body) -> @ast::expr {
let args = get_mac_args_no_max(cx,sp,arg,1u,"concat_idents");
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let mut res = "";
for args.each {|e|
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res += *expr_to_ident(cx, e, "expected an ident");
}
ret @{id: cx.next_id(),
node: ast::expr_path(@{span: sp, global: false, idents: ~[@res],
rp: none, types: ~[]}),
span: sp};
}