eval context for macros lives as long as the current module is compiled

tests/accept/run/tidgen.nim

@@ -0,0 +1,19 @@
+discard """
+  output: "3 4"
+"""
+
+import macros
+
+# Test compile-time state in same module
+
+var gid = 3
+
+macro genId(invokation: expr): expr =
+  result = newIntLitNode(gid)
+  inc gid
+
+proc Id1(): int = return genId()
+proc Id2(): int = return genId()
+
+echo Id1(), " ", Id2()
+