Problem with /accepts

[Roman Stawski]

Hello all


I'm coming across a problem with context definitions:

    \version "2.19.59"
    \layout {
        \context {
            \Staff
            \accepts P
        }
        \context {
            \name P
            \alias Voice
        }
    }

    \new Staff {
        \new P \relative c'' { c c c c }
    }


This blows up with the error

Interpreting music...ERROR: In procedure symbol->string:
    ERROR: Wrong type argument in position 1 (expecting symbol): ()
    Exited with return code 1.

If I comment out the '\accepts' compilation finishes, (but ignores the 
context P obviously).

Could someone let me know what I'm doing wrong here?

Thanks

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