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+# Trace notes
+
+Review status: pending human review.
+
+The main file enables MainFlag, independently checks lowercase mainflag, and skips a disabled nested region containing invalid source and switch changes. Hidden remains undefined and MainFlag remains defined until explicitly removed. A switch named Flag does not replace the ordinary variable. Neither input sees the other's switches. Enabled branches print 1 through 7, followed by a literal containing a directive name. These are compiler extensions.