close #7792 by adding a test

tests/macros/tmacro7.nim

@@ -0,0 +1,36 @@
+discard """
+  output: '''calling!stuff
+calling!stuff
+'''
+"""
+
+# issue #7792
+
+import macros
+
+
+proc callProc(str: string) =
+  echo "calling!" & str
+
+
+macro testMacro(code: typed): untyped =
+  let stmtList = newNimNode(nnkStmtList)
+
+  let stmts = code[6]
+
+  for n in stmts.children:
+    # the error happens here
+    stmtList.add(newCall(bindSym("callProc"), newLit("stuff")))
+
+  code[6] = stmtList
+
+  result = newEmptyNode()
+
+
+proc main() {.testMacro.} =
+  echo "test"
+  echo "test2"
+
+
+when isMainModule:
+  main()