From @masak

<TimToady> m​: say (S/Once/Twice/ given "Once upon a time")
<camelia> rakudo-moar a87fb4​: OUTPUT«Twice upon a time␤»
<TimToady> m​: say (S/Once/Twice/ andthen S/a/two/ given "Once upon a time")
<camelia> rakudo-moar a87fb4​: OUTPUT«atwo␤»

(Expected value here​: "Twice upon two time".)

<TimToady> a rather peculiar bug
* masak submits rakudobug
<masak> m​: $_ = "Once upon a time"; say (S/Once/Twice/ andthen S/a/two/)
<camelia> rakudo-moar a87fb4​: OUTPUT«atwo␤»

(Expected value here​: "Twice upon two time".)

<masak> m​: $_ = "Once upon a time"; say ($_ ~= ", kthx" andthen S/a/two/)
<camelia> rakudo-moar a87fb4​: OUTPUT«Once upon two time, kthx␤»

(This one is fine.)

<masak> ok, so both S/// are needed to trigger the bug
<masak> but not the given

From @zoffixznet

Still present in rakudo 405519​:

<Zoffix> m​: say (S/a/A/ andthen S/b/B/ given "ab")
<camelia> rakudo-moar 405519​: OUTPUT«bB␤»

From @zoffixznet

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TODO-fudged tests added in Raku/roast@72789d07a9

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The RT System itself - Status changed from 'new' to 'open'

From @zoffixznet

Digging into it, seems the cause is the `is raw` on the thunk in `andthen`, which is the `$/` of the previous S///

So the glitch is due to it overwriting the string while matching it? Or something along those lines?

<Zoffix> m​: $_ = "aaabbb"; dd -> $_ { S/b/B/ }( $/ = $_ );
<camelia> rakudo-moar b8f10c​: OUTPUT«Str $/ = "aaaBbb"␤»
<Zoffix> m​: $_ = "aaabbb"; dd -> $_ is raw { S/b/B/ }( $_ );
<camelia> rakudo-moar b8f10c​: OUTPUT«Str $/ = "aaaBbb"␤»

<Zoffix> m​: $_ = "aaabbb"; dd -> $_ is raw { S/b/B/ }( $/ = $_ );
<camelia> rakudo-moar b8f10c​: OUTPUT«Str $/ = "bB"␤»
<Zoffix> m​: $_ = "aaabbb"; dd -> $_ is raw { S/b/B/ }( $/ = $_ );
<camelia> rakudo-moar b8f10c​: OUTPUT«Str $/ = "bB"␤»

From @zoffixznet

Thank you for the report. This is now fixed.

Fix​: rakudo/rakudo@97359ae42e
Test unfudged in​: Raku/roast@b15e0a0d9b

@zoffixznet - Status changed from 'open' to 'resolved'