@nospecialize on argument destructuring

[theogf]

It looks like @nospecialize does not work on argument destructuring:

I want to use @nospecialize on a Pair (or a Tuple, does not matter) and Julia normally allows you to unpack the pair directly in the function definition:

foo((a, b)::Pair) = ...

However, I would like to @nospecialize the Pair and

foo(@nospecialize (a, b)::Pair) = ...

does not seem to be valid syntax, I get:

ERROR: syntax: "(a, b)" is not a valid function argument name around REPL[4]:1

It seems the macro code was not updated when argument destructuring was added?