Function syntax::ext::env::expand_option_env[src]
pub fn expand_option_env(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult>
pub fn expand_option_env(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult>
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct (or str), enum,
trait, typedef (or
tdef).