julia> import JuliaParser.Parser

julia> src = """
       function f(x)::Float64
           return x
       end
       """;

julia> parse(src)
:(function f(x)::Float64 # none, line 2:
        return x
    end)

julia> JuliaParser.Parser.parse(src)
:(function f(x) # none, line 1:
        ::Float64 # none, line 2:
        return x
    end)

julia> eval(JuliaParser.Parser.parse(src))
f (generic function with 1 method)

julia> f(1.0)
ERROR: ArgumentError: typeassert: too few arguments (expected 2)
 in f(::Float64) at ./none:1
 in eval(::Module, ::Any) at ./boot.jl:234
 in macro expansion at ./REPL.jl:92 [inlined]
 in (::Base.REPL.##1#2{Base.REPL.REPLBackend})() at ./event.jl:46