fixes #10651

compiler/jsgen.nim

@@ -1149,7 +1149,7 @@ template isIndirect(x: PSym): bool =
   let v = x
   ({sfAddrTaken, sfGlobal} * v.flags != {} and
     #(mapType(v.typ) != etyObject) and
-    {sfImportc, sfVolatile, sfExportc} * v.flags == {} and
+    {sfImportc, sfExportc} * v.flags == {} and
     v.kind notin {skProc, skFunc, skConverter, skMethod, skIterator,
                   skConst, skTemp, skLet})
 
@@ -1235,7 +1235,7 @@ proc genProcForSymIfNeeded(p: PProc, s: PSym) =
 
 proc genCopyForParamIfNeeded(p: PProc, n: PNode) =
   let s = n.sym
-  if p.prc == s.owner or needsNoCopy(p, n): 
+  if p.prc == s.owner or needsNoCopy(p, n):
     return
   var owner = p.up
   while true:
@@ -1597,8 +1597,7 @@ proc createVar(p: PProc, typ: PType, indirect: bool): Rope =
     internalError(p.config, "createVar: " & $t.kind)
     result = nil
 
-template returnType: untyped =
+template returnType: untyped = ~""
-  ~""
 
 proc genVarInit(p: PProc, v: PSym, n: PNode) =
   var

tests/js/tbasicenum.nim

@@ -1,10 +0,0 @@
-discard """
-  output: "ABCDC"
-"""
-
-type
-  MyEnum = enum
-    A,B,C,D
-# trick the optimizer with an seq:
-var x = @[A,B,C,D]
-echo x[0],x[1],x[2],x[3],MyEnum(2)

tests/js/tbasics.nim

@@ -0,0 +1,37 @@
+discard """
+  output: '''ABCDC
+1
+14
+ok'''
+"""
+
+type
+  MyEnum = enum
+    A,B,C,D
+# trick the optimizer with an seq:
+var x = @[A,B,C,D]
+echo x[0],x[1],x[2],x[3],MyEnum(2)
+
+# bug #10651
+
+var xa: seq[int]
+var ya = @[1,2]
+xa &= ya
+echo xa[0]
+
+proc test =
+  var yup: seq[int]
+  try:
+    yup.add 14
+    echo yup.pop
+  finally:
+    discard
+
+test()
+
+when true:
+  var a: seq[int]
+
+  a.setLen(0)
+
+  echo "ok"