fixes #569; C++ codegen works again

compiler/ccgexprs.nim

@@ -303,10 +303,11 @@ proc genAssignment(p: BProc, dest, src: TLoc, flags: TAssignmentFlags) =
       linefmt(p, cpsStmts, "$1 = $2;$n", rdLoc(dest), rdLoc(src))
   of tyObject:
     # XXX: check for subtyping?
-    if needsComplexAssignment(dest.t):
-      if asgnComplexity(dest.t.n) <= 4:
-        discard getTypeDesc(p.module, dest.t)
-        genOptAsgnObject(p, dest, src, flags, dest.t.n)
+    if needsComplexAssignment(ty):
+      if asgnComplexity(ty.n) <= 4:
+        discard getTypeDesc(p.module, ty)
+        internalAssert ty.n != nil
+        genOptAsgnObject(p, dest, src, flags, ty.n)
       else:
         genGenericAsgn(p, dest, src, flags)
     else:
@@ -642,14 +643,7 @@ proc genTupleElem(p: BProc, e: PNode, d: var TLoc) =
   case e.sons[1].kind
   of nkIntLit..nkUInt64Lit: i = int(e.sons[1].intVal)
   else: internalError(e.info, "genTupleElem")
-  when false:
-    if ty.n != nil:
-      var field = ty.n.sons[i].sym
-      if field == nil: InternalError(e.info, "genTupleElem")
-      if field.loc.r == nil: InternalError(e.info, "genTupleElem")
-      appf(r, ".$1", [field.loc.r])
-  else:
-    appf(r, ".Field$1", [toRope(i)])
+  appf(r, ".Field$1", [toRope(i)])
   putIntoDest(p, d, ty.sons[i], r)
 
 proc genRecordField(p: BProc, e: PNode, d: var TLoc) =
@@ -840,6 +834,7 @@ proc genAndOr(p: BProc, e: PNode, d: var TLoc, m: TMagic) =
 proc genEcho(p: BProc, n: PNode) =
   # this unusal way of implementing it ensures that e.g. ``echo("hallo", 45)``
   # is threadsafe.
+  discard lists.IncludeStr(p.module.headerFiles, "<stdio.h>")
   var args: PRope = nil
   var a: TLoc
   for i in countup(1, n.len-1):

lib/system/ansi_c.nim

@@ -58,7 +58,7 @@ else:
 
 proc c_longjmp(jmpb: C_JmpBuf, retval: cint) {.
   header: "<setjmp.h>", importc: "longjmp".}
-proc c_setjmp(jmpb: var C_JmpBuf): cint {.
+proc c_setjmp(jmpb: C_JmpBuf): cint {.
   header: "<setjmp.h>", importc: "setjmp".}
 
 proc c_signal(sig: cint, handler: proc (a: cint) {.noconv.}) {.

lib/system/gc.nim

@@ -759,7 +759,7 @@ else:
     # Used to traverse the stack and registers assuming
     # that 'setjmp' will save registers in the C stack.
     type PStackSlice = ptr array [0..7, pointer]
-    var registers: C_JmpBuf
+    var registers {.noinit.}: C_JmpBuf
     if c_setjmp(registers) == 0'i32: # To fill the C stack with registers.
       var max = cast[TAddress](gch.stackBottom)
       var sp = cast[TAddress](addr(registers))

lib/system/gc_ms.nim

@@ -449,7 +449,7 @@ else:
     # Used to traverse the stack and registers assuming
     # that 'setjmp' will save registers in the C stack.
     type PStackSlice = ptr array [0..7, pointer]
-    var registers: C_JmpBuf
+    var registers {.noinit.}: C_JmpBuf
     if c_setjmp(registers) == 0'i32: # To fill the C stack with registers.
       var max = cast[TAddress](gch.stackBottom)
       var sp = cast[TAddress](addr(registers))

tests/run/tvarious1.nim

@@ -1,7 +1,8 @@
 discard """
   file: "tlenopenarray.nim"
   output: '''1
-0'''
+0
+Whopie'''
 """
 
 echo len([1_000_000]) #OUT 1
@@ -12,3 +13,17 @@ type
 proc `[]`(v: TVector; idx: int): int = TArray(v)[idx]
 var v: TVector
 echo v[2]
+
+# bug #569
+
+import queues
+
+type
+  TWidget = object
+    names: TQueue[string]
+
+var w = TWidget(names: initQueue[string]())
+
+add(w.names, "Whopie")
+
+for n in w.names: echo(n)