[perl #117997] [BUG] STD warns about no-argument use of 'set' listop, Rakudo doesn't

[Carl Mäsak]

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<TimToady> std: set<a b c>;
<camelia> std e2a36d8: OUTPUT«===SORRY!===␤The 'set' listop may not be
called without arguments (please use () or whitespace to clarify) at
/tmp/PADZ4qSrTX line 1:␤------> set⏏<a b c>;␤Potential difficulties:␤
Use of non-subscript <...> where postfix is expec…
<TimToady> std: set;
<camelia> std e2a36d8: OUTPUT«===SORRY!===␤The 'set' listop may not be
called without arguments (please use () or whitespace to clarify) at
/tmp/t3YsN5H42z line 1:␤------> set⏏;␤Check failed␤FAILED 00:00 41m␤»
<TimToady> std: set();
<camelia> std e2a36d8: OUTPUT«ok 00:00 41m␤»
<masak> rn: set<a b c>;
<camelia> rakudo 170856, niecza v24-51-g009f999: ( no output )
* masak submits rakudobug
<masak> rn: set;
<camelia> rakudo 170856, niecza v24-51-g009f999: ( no output )

[Christian Bartolomaeus via RT]

Rakudo (on Moar, Parrot and JVM) now gives the same error as STD:

$ perl6 -e 'set;'
===SORRY!=== Error while compiling -e

The 'set' listop may not be called without arguments (please use () or whitespace to clarify)

at -e:1
------> set⏏;
expecting any of:
argument list

$ perl6 -e 'set<a b c>;'

===SORRY!===
The 'set' listop may not be called without arguments (please use () or whitespace to clarify)

at -e:1

------> set⏏<a b c>;

expecting any of:
argument list
Other potential difficulties:
Use of non-subscript <...> where postfix is expected; please use whitespace
at -e:1

------> set⏏<a b c>;

I added two tests to S03-operators/set.t with the following commit: https://github.com/perl6/roast/commit/d45a07596b