Handle Julia 1.12 expressions with multiple semicolons

[omus]

Fixes #43. In Julia 1.12 the way the expression (x; y; z) -> 0 differs from older versions of Julia:

Julia 1.12.6:

julia> Meta.@dump (x; y; z) -> 0
Expr
  head: Symbol ->
  args: Array{Any}((2,))
    1: Expr
      head: Symbol tuple
      args: Array{Any}((2,))
        1: Expr
          head: Symbol parameters
          args: Array{Any}((2,))
            1: Expr
              head: Symbol parameters
              args: Array{Any}((1,))
                1: Symbol z
            2: Symbol y
        2: Symbol x
    2: Expr
      head: Symbol block
      args: Array{Any}((2,))
        1: LineNumberNode
          line: Int64 1
          file: Symbol REPL[2]
        2: Int64

Julia 1.11.9

julia> Meta.@dump (x; y; z) -> 0
Expr
  head: Symbol ->
  args: Array{Any}((2,))
    1: Expr
      head: Symbol block
      args: Array{Any}((5,))
        1: Symbol x
        2: LineNumberNode
          line: Int64 1
          file: Symbol REPL[1]
        3: Symbol y
        4: LineNumberNode
          line: Int64 1
          file: Symbol REPL[1]
        5: Symbol z
    2: Expr
      head: Symbol block
      args: Array{Any}((2,))
        1: LineNumberNode
          line: Int64 1
          file: Symbol REPL[1]
        2: Int64 0

This syntax isn't a valid function so I've updated the code to detect this as an invalid definition.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.46%. Comparing base (f650f43) to head (1a117ac).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   97.41%   97.46%   +0.05%     
==========================================
  Files           6        6              
  Lines         232      237       +5     
==========================================
+ Hits          226      231       +5     
  Misses          6        6              

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[oxinabox]

Suggested change

	if arg isa Expr && arg.head === :parameters
	if Meta.isexpr(arg, :parameters)

I am surprised that isn't used more in here?

[omus]

We should probably update this code to use Meta.isexpr. I'll leave it as I wrote it though so that everything is consistent. We can do a follow up PR for that change.

[omus]

I'll leave the fix for the nightly failure out of this PR