From @masak

r30183​:
$ ./perl6 -e 'grammar A { token b { c } }; "c" ~~ A​::b' # works
$ ./perl6 -e 'grammar A { token b { <c> } }; "c" ~~ A​::b' # fails
Unable to find regex 'c'
Null PMC access in invoke()
[...]

To be clear, the bug is not about the failure itself (which is
expected), but about the Null PMC access that follows it.

From @kyleha

On Tue Aug 12 11​:55​:47 2008, masak wrote​:

r30183​:
$ ./perl6 -e 'grammar A { token b { c } }; "c" ~~ A​::b' # works
$ ./perl6 -e 'grammar A { token b { <c> } }; "c" ~~ A​::b' # fails
Unable to find regex 'c'
Null PMC access in invoke()
[...]

To be clear, the bug is not about the failure itself (which is
expected), but about the Null PMC access that follows it.

Testing with 116fa46b40260e5777db96a05ef75dba0cd41f05 now, this gives a
new error message and no Null PMC access.

$ ./perl6 -e 'grammar A { token b { <c> } }; "c" ~~ A​::b'
too few arguments passed (0) - 2 params expected
in regex A​::b (<unknown>​:1)
called from Main (<unknown>​:1)

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

From @masak

Confirmed. Resolving.

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