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$ perl -Mstrict -Mdiagnostics -e'$foo = "bar";$bar = "baz";print $$foo
+, $/'
Global symbol "$foo" requires explicit package name at -e line 1
Global symbol "$bar" requires explicit package name at -e line 1
...
Global symbol "$foo" requires explicit package name at -e line 1
Execution of -e aborted due to compilation errors
$

$ perl -Mstrict -Mdiagnostics -e'my $foo = "bar";my $bar = "baz";print
+ $$foo, $/'
Can't use string ("bar") as a SCALAR ref while "strict refs" in use at
+ -e line
        1 (#1)
...
Uncaught exception from user code:
        Can't use string ("bar") as a SCALAR ref while "strict refs" i
+n use at -e line 1
$

$ perl -Mstrict -Mdiagnostics -e'my $foo = \my $bar; $bar = "baz"; pri
+nt $$foo, $/'
baz
$