From @masak

<masak> rakudo​: say "foo".substr(4).WHAT
<p6eval> rakudo 937177​: OUTPUT«Mu()␤»
* masak submits rakudobug

Trying to do further string operations on the Mu object (such as
string concatenation) turns out not to work too well.

No applicable candidates found to dispatch to for 'infix​:<~>'.
Available candidates are​:
:(Any $x = { ... })
:(Any $a, Any $b)

I'd expect it to return "".

@coke - Status changed from 'new' to 'open'

From @coke

On Thu Jul 22 18​:15​:30 2010, masak wrote​:

<masak> rakudo​: say "foo".substr(4).WHAT
<p6eval> rakudo 937177​: OUTPUT«Mu()␤»
* masak submits rakudobug

Trying to do further string operations on the Mu object (such as
string concatenation) turns out not to work too well.

No applicable candidates found to dispatch to for 'infix​:<~>'.
Available candidates are​:
:(Any $x = { ... })
:(Any $a, Any $b)

I'd expect it to return "".

It now returns a failure, which seems plausible.

14​:32 < [Coke]> rakudo​: say "foo".substr(4).WHAT
14​:32 <+p6eval> rakudo 1c2c2d​: OUTPUT«Failure()␤»

Marking as needs tests.

--
Will "Coke" Coleda

From @bbkr

Test in

Raku/roast@c1c897cf4f

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