Track local label scope, string equated as .. (#1504)

test/asm/period.asm

@@ -1,6 +1,33 @@
-section "period", rom0
+SECTION "period", ROM0
 
-global1: db 1
-.local   db 2
-.        db 3 ; this...
-global1  db 4 ; ...expands to this
+assert !def(.) && !def(..)
+
+global1:
+assert !strcmp("{.}", "global1") && !def(..)
+
+.local1:
+assert !strcmp("{.}", "global1") && !strcmp("{..}", "global1.local1")
+
+global1.local2:
+assert !strcmp("{.}", "global1") && !strcmp("{..}", "global1.local2")
+
+global2:
+assert !strcmp("{.}", "global2") && !def(..)
+
+.local1:
+assert !strcmp("{.}", "global2") && !strcmp("{..}", "global2.local1")
+
+LOAD "load", WRAM0
+assert !def(.) && !def(..)
+
+wGlobal1:
+assert !strcmp("{.}", "wGlobal1") && !def(..)
+
+.wLocal1:
+assert !strcmp("{.}", "wGlobal1") && !strcmp("{..}", "wGlobal1.wLocal1")
+
+wGlobal2:
+assert !strcmp("{.}", "wGlobal2") && !def(..)
+
+ENDL
+assert !strcmp("{.}", "global2") && !strcmp("{..}", "global2.local1")