----------------------------------------------------------------------
inst_word_lengths                                           (wordsLib)
----------------------------------------------------------------------
inst_word_lengths : term -> term

SYNOPSIS
Guess and instantiate word index type variables in a term.

DESCRIBE
The function {inst_word_lengths} tries to instantiate type variables that
correspond with the return type of {word_concat} and {word_extract}.

EXAMPLE

- load "wordsLib";
...
- wordsLib.inst_word_lengths ``(7 >< 5) a @@ (4 >< 0) a``;
<<HOL message: inventing new type variable names: 'a, 'b, 'c, 'd>>
<<HOL message: assigning word length(s): 'a <- 3, 'b <- 5 and 'c <- 8>>
> val it =
    ``(((7 :num) >< (5 :num)) (a :bool['d]) :bool[3]) @@
      (((4 :num) >< (0 :num)) a :bool[5])`` : term
- type_of it;
> val it = ``:bool[8]`` : hol_type


COMMENTS
The function {guess_lengths} adds {inst_word_lengths} as a post-processing
stage to the term parser.

SEEALSO
wordsLib.guess_lengths, wordsLib.notify_on_word_length_guess.

----------------------------------------------------------------------