From @titsuki

See the following results.

$ perl6 -e '("10"..15).rand.say' # min is Str
Can only get a random value on Real values, did you mean .pick?
  in block <unit> at -e line 1

Actually thrown at​:
  in block <unit> at -e line 1

$ perl6 -e '(10.."15").rand.say' # max is Str
13.1798515362137

I think that the 2nd example should cause the error same as the 1st example.

From @titsuki

Sorry, my Perl 6 version is

$ perl6 --version
This is Rakudo version 2016.07.1-199-gdd9b760 built on MoarVM version 2016.07-17-g40948f6
implementing Perl 6.c.

On 2016-8月-26 金 19​:23​:02, cookbook_000@​yahoo.co.jp wrote​:

See the following results.

$ perl6 -e '("10"..15).rand.say' # min is Str
Can only get a random value on Real values, did you mean .pick?
in block <unit> at -e line 1

Actually thrown at​:
in block <unit> at -e line 1

$ perl6 -e '(10.."15").rand.say' # max is Str
13.1798515362137

I think that the 2nd example should cause the error same as the 1st example.

From @titsuki

I've sent a pull request for this issue.
rakudo/rakudo#863

On 2016-8月-26 金 19​:23​:02, cookbook_000@​yahoo.co.jp wrote​:

See the following results.

$ perl6 -e '("10"..15).rand.say' # min is Str
Can only get a random value on Real values, did you mean .pick?
in block <unit> at -e line 1

Actually thrown at​:
in block <unit> at -e line 1

$ perl6 -e '(10.."15").rand.say' # max is Str
13.1798515362137

I think that the 2nd example should cause the error same as the 1st example.

From @zoffixznet

The issue is due to there being a multi new [^1] that takes a Real min value and *coerces* the max value to a real. So in the case described in this ticket, it will coerce the Str max to Int, and by the time we get to .rand, both args are Ints.

As suggested on IRC [^2], we can try removing that coercion and see if something explodes or not, but I'm unsure of the reasons that coercion is there.

[^1] https://github.com/rakudo/rakudo/blob/aceb4af2/src/core/Range.pm#L51
[^2] http://irclog.perlgeek.de/perl6/2016-09-04#i_13145737