Don't report unused hints for consumed AST (#18270)

* Fix #18203

* Add testcase

* Fix testcase

* Fix test

compiler/lookups.nim

@@ -364,7 +364,9 @@ proc openShadowScope*(c: PContext) =
 
 proc closeShadowScope*(c: PContext) =
   ## closes the shadow scope, but doesn't merge any of the symbols
-  c.closeScope
+  ## Does not check for unused symbols or missing forward decls since a macro
+  ## or template consumes this AST
+  rawCloseScope(c)
 
 proc mergeShadowScope*(c: PContext) =
   ## close the existing scope and merge in all defined symbols, this will also

tests/macros/t18203.nim

@@ -0,0 +1,15 @@
+discard """
+  matrix: "--hint:SuccessX:off --hint:Link:off --hint:Conf:off --hint:CC:off --hint:XDeclaredButNotUsed:on"
+  nimout: '''
+'''
+nimoutFull: true
+action: compile
+"""
+
+# bug #18203
+import std/macros
+
+macro foo(x: typed) = newProc ident"bar"
+proc bar() {.foo.} = raise
+bar()
+