> Interesting (I expected a compilation error here, similar as with number predecrement, e.g. --5):
hmm me too.
My theory is that the scalar aassign in the concise output returns a modifiable value, but that the compiler "forgot" to moan here.
That's probably an implementation detail that might change in the future and break this code.
C:\>perl -e "@a=1..5; print 0+( @a );"
5
C:\>perl -e "@a=1..5; print --( @a);"
Can't modify array dereference in predecrement (--) at -e line 1, near
+ ");"
Execution of -e aborted due to compilation errors.
C:\>perl -MO=Concise -e "print --( () = /;/g );"
a <@> leave[1 ref] vKP/REFC ->(end)
1 <0> enter ->2
2 <;> nextstate(main 1 -e:1) v:{ ->3
9 <@> print vK ->a
3 <0> pushmark s ->4
8 <1> predec sK/1 ->9
7 <2> aassign[t1] sKPRMS ->8
- <1> ex-list lK ->6
4 <0> pushmark s ->5
5 </> match(/";"/) l/RTIME ->6
- <1> ex-list lK ->7
6 <0> pushmark s ->7
- <0> stub lPRM* ->-
-e syntax OK
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