Derive Macro cssparser_macros::cssparser_internal__phf_map

#[derive(cssparser_internal__phf_map)]

Input: parsed as token trees. The first TT is a type. (Can be wrapped in parens.) following TTs are grouped in pairs, each pair being a key as a string literal and the corresponding value as a const expression.

Output: a rust-phf map, with keys ASCII-lowercased:

static MAP: &'static ::cssparser::phf::Map<&'static str, $ValueType> = …;