isdefined check in locals() (#396)

* isdefined check  in locals()


Co-authored-by: Tim Holy <tim.holy@gmail.com>
Co-authored-by: Kristoffer Carlsson <kricarl@student.chalmers.se>

Author: 3 people

src/utils.jl

@@ -425,7 +425,9 @@ function locals(frame::Frame)
         if var.name === Symbol("#self#")
             for field in fieldnames(typeof(var.value))
                 field = field::Symbol
-                push!(vars, Variable(getfield(var.value, field), field, false, true))
+                if isdefined(var.value, field)
+                    push!(vars, Variable(getfield(var.value, field), field, false, true))
+                end
             end
         end
     end

test/interpret.jl

@@ -640,3 +640,11 @@ end
     D = Diagonal([1.0, 2.0])
     @test @interpret(f(D)) === f(D)
 end
+
+struct A396
+    a::Int
+end
+@testset "constructor locals" begin
+    frame = JuliaInterpreter.enter_call(A396, 3)
+    @test length(JuliaInterpreter.locals(frame)) > 0
+end