Avoid error on methods(Vararg) (#4)

Author: timholy

src/visit.jl

@@ -87,6 +87,7 @@ end
 
 function _visit(@nospecialize(operation), @nospecialize(f::Callable), visited::IdSet{Any}, print::Bool)
     f ∈ visited && return nothing
+    f === Vararg && return nothing   # methods(Varargs) errors due to Type{Vararg}
     push!(visited, f)
     print && println("Callable ", f)
     if operation(f)

test/runtests.jl

@@ -50,6 +50,14 @@ end
     @test Base ∈ mods
     @test Base.Checked ∈ mods
     @test length(mods) == length(unique(mods))
+
+    # methods(Vararg) throws an error
+    nitems = Ref(0)
+    visit(Vararg) do item
+        nitems[] += 1
+        true
+    end
+    @test nitems[] == 0
 end
 
 @testset "Backedges" begin