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>perl -e"use diagnostics; use strict; print ${'x'}"
Can't use string ("x") as a SCALAR ref while "strict refs" in use at -
+e line 1 (#1)
...
Uncaught exception from user code:
        Can't use string ("x") as a SCALAR ref while "strict refs" in 
+use at -e line 1.
 at -e line 1