From @raiph

What I did

$/ := "Uhoh";
put "Foo".subst​: /Foo/, -> $/ {$/};
put "Foo".subst​: /Foo/, -> $/ {$/} for 1;
put "Foo".subst​: /Foo/, {$/};
put "Foo".subst​: /Foo/, {$/} for 1;

What I expected

FooFooFooFoo

What I got

FooFooUhohUhoh

Is it a bug?

The way it's working now might make sense from a purist pov but not a pragmatic or Perlish one imo. I'm hoping this will be obvious to whoever reads this so I'll defer giving a detailed rationale for calling this a bug in the anticipation that it won't be necessary. :)

Does it look like any other bug?

Yes, at least the previously resolved s/// bug #​118705.

See also http://www.perlmonks.org/?node_id=1148378

From @raiph

See also #RT122789

From @zoffixznet

On Mon, 23 Nov 2015 19​:40​:36 -0800, raiph wrote​:

What I did

$/ := "Uhoh";
put "Foo".subst​: /Foo/, -> $/ {$/};
put "Foo".subst​: /Foo/, -> $/ {$/} for 1;
put "Foo".subst​: /Foo/, {$/};
put "Foo".subst​: /Foo/, {$/} for 1;

What I expected

FooFooFooFoo

What I got

FooFooUhohUhoh

Is it a bug?

The way it's working now might make sense from a purist pov but not a
pragmatic or Perlish one imo. I'm hoping this will be obvious to
whoever reads this so I'll defer giving a detailed rationale for
calling this a bug in the anticipation that it won't be necessary. :)

Does it look like any other bug?

Yes, at least the previously resolved s/// bug #​118705.

See also http://www.perlmonks.org/?node_id=1148378

Thank you for the report. This is now fixed.

Fix​: rakudo/rakudo@738908be4d
Test​: Raku/roast@80a49c4324

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

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

From @zoffixznet

On Sat, 21 Oct 2017 08​:28​:19 -0700, cpan@​zoffix.com wrote​:

On Mon, 23 Nov 2015 19​:40​:36 -0800, raiph wrote​:

What I did

$/ := "Uhoh";
put "Foo".subst​: /Foo/, -> $/ {$/};
put "Foo".subst​: /Foo/, -> $/ {$/} for 1;
put "Foo".subst​: /Foo/, {$/};
put "Foo".subst​: /Foo/, {$/} for 1;

What I expected

FooFooFooFoo

What I got

FooFooUhohUhoh

Is it a bug?

The way it's working now might make sense from a purist pov but not a
pragmatic or Perlish one imo. I'm hoping this will be obvious to
whoever reads this so I'll defer giving a detailed rationale for
calling this a bug in the anticipation that it won't be necessary. :)

Does it look like any other bug?

Yes, at least the previously resolved s/// bug #​118705.

See also http://www.perlmonks.org/?node_id=1148378

Thank you for the report. This is now fixed.

Fix​: rakudo/rakudo@738908be4d
Test​: Raku/roast@80a49c4324

I ended up reverting the tests and the fix. There was fallout from ~20 modules due to this
and it feels to me having method forms mess with $/ is going against the grain for how the
users tend to use these routines.

I filed another Issue rakudo/rakudo#1235 for this problem.