closes #7374 (#15781)

* add testcase for #7374

* minor

* fix test

(cherry picked from commit 1725db9295)

tests/template/tshadow.nim

@@ -0,0 +1,29 @@
+discard """
+  output: '''fish
+fish'''
+"""
+
+import macros
+
+block:
+  template init(initHook: proc(s: string)) =
+    proc dostuff =
+      var s = "fish"
+      initHook(s)
+    dostuff()
+
+  init do(s: string):
+    echo s
+
+block:
+  macro init(initHook: proc(s: string)) =
+    result = newStmtList(
+      newProc(name = ident("dostuff"), body = newStmtList(
+        newVarStmt(ident("s"), newStrLitNode("fish")),
+        newCall(initHook, ident("s"))
+      )),
+      newCall("dostuff")
+    )
+
+  init proc(s: string) =
+    echo s