Ranged expansion problem / bug

I tried to compile my .kmn which include this code
store(nglegena) [K_B] .. [K_D] [K_G] [K_H] [K_J] .. [K_N] [K_P] [K_R] .. [K_T] [K_W] [K_Y] [K_Z]
and the developer got angry and quit :joy::joy::joy:

cf. Range expansions

my intent is to include all consonant keys only, no vocal keys. Apparently this result in a bug in the developer, not even error code, just plain “I quit!”, lol. I tried several times with the same result. Deleting that line of code fixed the developer.

Ouch. But fortunately easy to reproduce so should be easy to find the cause. I will chase it down…