fixes #5417

tests/template/tgensym_label.nim

@@ -0,0 +1,18 @@
+
+# bug #5417
+import macros
+
+macro genBody: untyped =
+  let sbx = genSym(nskLabel, "test")
+  when true:
+    result = quote do:
+      block `sbx`:
+        break `sbx`
+  else:
+    template foo(s1, s2) =
+      block s1:
+        break s2
+    result = getAst foo(sbx, sbx)
+
+proc test() =
+  genBody()