Revert "fixes #24800; Invalid C code generation with a method, case object in…"

This reverts commit ddd83f8d8a.

compiler/ccgexprs.nim

@@ -2638,8 +2638,7 @@ proc genRangeChck(p: BProc, n: PNode, d: var TLoc) =
 
 proc genConv(p: BProc, e: PNode, d: var TLoc) =
   let destType = e.typ.skipTypes({tyVar, tyLent, tyGenericInst, tyAlias, tySink})
-  let srcType = e[1].typ.skipTypes({tyVar, tyLent, tyGenericInst, tyAlias, tySink})
-  if sameBackendTypeIgnoreRange(destType, srcType):
+  if sameBackendTypeIgnoreRange(destType, e[1].typ):
     expr(p, e[1], d)
   else:
     genSomeCast(p, e, d)

tests/tuples/ttuples_various.nim

@@ -1,12 +1,11 @@
 discard """
-matrix: "--mm:refc; --mm:arc"
 output: '''
 it's nil
 @[1, 2, 3]
 '''
 """
 
-import std/[options, macros]
+import macros
 
 
 block anontuples:
@@ -210,21 +209,3 @@ block: # tuple unpacking assignment with underscore
   doAssert (a, b) == (6, 2)
   (b, _) = (7, 8)
   doAssert (a, b) == (6, 7)
-
-# bug #24800
-type
-  B[T] = object
-    case r: bool
-    of false:
-      v: ref int
-    of true:
-      x: T
-  U = ref object of RootObj
-
-method y(_: U) {.base.} =
-  var s = default(B[tuple[f: B[int], w: B[int]]])
-  discard some(s.x)
-
-proc foo =
-  var s = U()
-  y(s)