SIGNAL VALUE varname raises ERROR 16.1 'Label "var_value" not found', even though the label exists.

[RossPatterson]

bREXX 1.0.1 SIGNAL VALUE varname raises ERROR 16.1 'Label "var_value" not found', even though the label exists.
VM/SP 5 works.

Test case:

/* */
trace i
var = 'my_label'
signal value var
say 'How did I get here?'
exit 0

my_label:
say 'I got here!'
exit 0

bREXX 1.0.1:

doit
     3 *-* var = 'my_label'
       >L>   "my_label"
     4 *-* signal value var
       >V>   "my_label"
     4 *-* signal value var
Error 16.1 running doit, line 4: Label "my_label" not found
Ready(20016);

VM/SP 5:

 doit
     3 *-* var = 'my_label'
       >L>   "my_label"
     4 *-* signal value var
       >V>   "my_label"
     8 *-* my_label:
     9 *-* say 'I got here!'
       >L>   "I got here!"
I got here!
    10 *-* exit 0
       >L>   "0"
Ready; T=0.01/0.01 09:14:53