From @ajs

Via IRC​:

[13​:51] <harmil_wk> a very slightly LTA error​:
[13​:51] <harmil_wk> m​: sub test { return (state $x = 0 )++; POST { $_++ }
}; say test
[13​:51] <+camelia> rakudo-moar 58cf9d​: OUTPUT«Cannot resolve caller
postfix​:<++>(Int); none of these signatures match​:␤ (Mu​:D $a is rw)␤
(Mu​:U $a is rw)␤ (Int​:D $a is rw)␤ (int $a is rw)␤ (Bool​:U $a is
rw)␤ (Bool​:D $a is rw)␤ (Num​:D $a is rw)␤ (Num​:U $a is rw)…»
[13​:52] <harmil_wk> It really would be nice if the error simply told me
that I was trying to modify a non-read-only rather than making me visually
parse the "is rw" on all of those.
[13​:52] <harmil_wk> Should I rakudobug that?
[13​:55] <masak> harmil_wk​: sure, why not -- though I'm not sure the verdict
will be "we can haz nice error" on that :/

--
Aaron Sherman, M.​:
P​: 617-440-4332 Google Talk, Email and Google Plus​: ajs@​ajs.com
Toolsmith, developer, gamer and life-long student.

From @zoffixznet

On Thu, 29 Sep 2016 11​:01​:49 -0700, ajs wrote​:

Via IRC​:

[13​:51] <harmil_wk> a very slightly LTA error​:
[13​:51] <harmil_wk> m​: sub test { return (state $x = 0 )++; POST { $_++ }
}; say test
[13​:51] <+camelia> rakudo-moar 58cf9d​: OUTPUT«Cannot resolve caller
postfix​:<++>(Int); none of these signatures match​:␤ (Mu​:D $a is rw)␤
(Mu​:U $a is rw)␤ (Int​:D $a is rw)␤ (int $a is rw)␤ (Bool​:U $a is
rw)␤ (Bool​:D $a is rw)␤ (Num​:D $a is rw)␤ (Num​:U $a is rw)…»
[13​:52] <harmil_wk> It really would be nice if the error simply told me
that I was trying to modify a non-read-only rather than making me visually
parse the "is rw" on all of those.
[13​:52] <harmil_wk> Should I rakudobug that?
[13​:55] <masak> harmil_wk​: sure, why not -- though I'm not sure the verdict
will be "we can haz nice error" on that :/

--
Aaron Sherman, M.​:
P​: 617-440-4332 Google Talk, Email and Google Plus​: ajs@​ajs.com
Toolsmith, developer, gamer and life-long student.

This has been addressed (as part of another ticket ticket, or perhaps it was you on IRC who caused me to fix this). The new error is more A​:

Cannot resolve caller postfix​:<++>(Int); the following candidates
match the type but require mutable arguments​:
  (Mu​:D $a is rw)
  (Int​:D $a is rw)

The following do not match for other reasons​:
  (Bool​:D $a is rw)
  (Bool​:U $a is rw)
  (Mu​:U $a is rw)
  (Num​:D $a is rw)
  (Num​:U $a is rw)
  (int $a is rw)
  (num $a is rw --> num)
  in sub test at -e line 1
  in block <unit> at -e line 1

Marking as tests needed (which I think should go to into rakudo's t/, since they'd be checking raw content of an output message).

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

From @zoffixznet

Test added​: rakudo/rakudo@e327f3049a

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