.he 'MISHAP025''Page %'
.fo 'Aaron Sloman''February'
.sp
: 25	Bad arguments for identprops
.br
In POP11 words have 'identprops', or syntactic properties. The
three commonest types of word are 'syntax' (eg 'if', 'end'),
'operation' (eg '=', '+', '>') and normal variables.
Variable declarations and function definitions set a word's
syntactic category - which cannot then be ever changed (unless
the word is 'cancelled'). Attempts to change a word's type will
give you error 25. Notice that if a word is not declared before
it is encountered by the POP11 system it will be assumed to be
of 'normal' type.
