in reply to Order of evaluation/interpolation of references

Good question++ I don't have an answer, but an equally intriguing variation:

C:\test>perl -E"{my$x=0; sub X{++$x;\$x}} say qq[${X()}${X()}${X()}${X
+()}${X()}${X()}]"
223456

C:\test>perl -E"{my$x=0; sub X{++$x;\$x}} say qq[${X()} ${X()}${X()}${
+X()}${X()}${X()}]"
1 23456

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