Better error for trailing commas in `using` about juliasyntax.jl HOT 2 OPEN

This is made slightly trickier by the fact that function can be used as a valid identifier there:

julia> module A
       b = 2
       var"function" = 3
       end
Main.A

julia> using .A: b,
       function

julia> using .A: b,
       function foo()
ERROR: syntax: extra token "foo" after end of expression
Stacktrace:
 [1] top-level scope
   @ none:1

Then again, this is a really good use case for post-hoc diagnostics instead of limited lookahead during parsing :)

from juliasyntax.jl.

Yes exactly 👍 The same kind of problem happens for struct definitions or other keywords like if.

from juliasyntax.jl.