Macro rustc_middle::ty::query::opt_remap_env_constness

macro_rules! opt_remap_env_constness {
    ([] [$name : ident]) => { ... };
    ([(remap_env_constness) $($rest : tt) *] [$name : ident]) => { ... };
    ([$other : tt $($modifiers : tt) *] [$name : ident]) => { ... };
}