Syntax error on array index

[Barry Wiseman]

5.0.15 on linux

I was asked to debug why rcabe reports the following error (and then SEGV's when you press Enter):

*** A filePro Error Has Occurred ***

Line Number: 1934

code(g)="F";dscr(h)=""{sj; amt(j)=isa ;ext(k)=isa ;glc(l)=iqi
                                                          ^
Process contains a syntax error at position indicated.


glc is an array mapped to a lookup, l is (3,.0), iqi is an uncast DECLARE. Actually the glc(l) was the problem, even glc(l)="" gave the same error.

Long story short, the following change fixes it.

code(g)="F";dscr(h)=""{sj; amt(j)=isa ;ext(k)=isa ;glc(l )=iqi
                                                       ^^^^

Is this a known bug in 5.0.15?  Without the space, what does rcabe think he's seeing?  The tags "glc" and "l" are both quite unambiguous in the program.  Why don't the similar "amt(j)" and "ext(k)" throw errors?