fn __action312<'i, L>(
    ctx: &ParseContext,
    (_, t, _): (LexerPosition, FullySpecifiedType, LexerPosition),
) -> SingleDeclarationDatawhere
    L: HasLexerError,fn __action312<'i, L>(
    ctx: &ParseContext,
    (_, t, _): (LexerPosition, FullySpecifiedType, LexerPosition),
) -> SingleDeclarationDatawhere
    L: HasLexerError,