Assembler: fix bug with processMethodSignature.

Author: ForNeVeR

Naggum.Assembler/Assembler.fs

@@ -37,7 +37,7 @@ let processMethodSignature = function
           ContainingType = Some (resolveType typeName) // TODO: Resolve methods without a type (e.g. assembly methods)
           Name = methodName
           ArgumentTypes = resolveTypes argumentTypes
-          ReturnType = resolveType typeName }
+          ReturnType = resolveType returnType }
     | other -> failwithf "Unrecognized method signature: %A" other
 
 let processInstruction = function

Naggum.Assembler/Representation.fs

@@ -36,3 +36,4 @@ type AssemblyUnit =
 type Assembly =
     { Name : string
       Units : AssemblyUnit list }
+    override this.ToString () = sprintf "%A" this

Naggum.Test/AssemblerTests.fs

@@ -31,6 +31,7 @@ let checkPreparationResult (source : string) (expected : Assembly list) =
     use stream = new MemoryStream(Encoding.UTF8.GetBytes source)
     let actual = Assembler.prepare "file.ngi" stream |> Seq.toList
 
+    Assert.Equal (expected.ToString (), actual.ToString ()) // for diagnostic
     Assert.Equal<Assembly list> (expected, actual)
 
 [<Fact>]