.he 'MISHAP015''Page %'
.fo 'Aaron Sloman''February 78'
.sp
: 15 	Impermissible item in variable list
.br
You'll get this error in a function definition or "vars"
declaration if you try to use as a variable a word which is
already reserved in pop11, like "if" or "end".
A common source of error 15 is forgetting to put the 
semi-colon after the delcaration e.g. "VARS x y z;",
or leaving out the semi-colon at the end of the first line of
a function definition, or possibly leaving out the ")" in a
function definition, e.g. "function square(side;"
