fixes #3431, fixes #3370, fixes #3468

compiler/cgmeth.nim

@@ -66,15 +66,16 @@ proc sameMethodBucket(a, b: PSym): MethodResult =
         bb = bb.lastSon
       else:
         break
-    if sameType(aa, bb): discard
+    if sameType(aa, bb):
+      if aa.kind == tyObject and result != Invalid: result = Yes
     elif aa.kind == tyObject and bb.kind == tyObject:
       let diff = inheritanceDiff(bb, aa)
-      if diff < 0: discard "Ok"
+      if diff < 0:
+        if result != Invalid: result = Yes
       elif diff != high(int):
         result = Invalid
     else:
       return No
-  if result != Invalid: result = Yes
 
 proc attachDispatcher(s: PSym, dispatcher: PNode) =
   var L = s.ast.len-1

tests/method/tmultim7.nim

@@ -0,0 +1,48 @@
+
+# bug #3431
+
+type
+  Lexer = object
+    buf*: string
+    pos*: int
+    lastchar*: char
+
+  ASTNode = object
+
+method init*(self: var Lexer; buf: string) {.base.} =
+  self.buf = buf
+  self.pos = 0
+  self.lastchar = self.buf[0]
+
+method init*(self: var ASTNode; val: string) =
+  discard
+
+
+# bug #3370
+type
+  RefTestA*[T] = ref object of RootObj
+    data*: T
+
+method tester*[S](self: S): bool =
+  true
+
+type
+  RefTestB* = RefTestA[(string, int)]
+
+method tester*(self: RefTestB): bool =
+  true
+
+type
+  RefTestC = RefTestA[string]
+
+method tester*(self: RefTestC): bool =
+  false
+
+
+# bug #3468
+
+type X = ref object of RootObj
+type Y = ref object of RootObj
+
+method draw*(x: X) {.base.} = discard
+method draw*(y: Y) {.base.} = discard