32 Finding Mutated Variables

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find-mutated-vars

Version: 5.0.1.5
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### 32`` Finding Mutated Variables

Sam Tobin-Hochstadt <samth@ccs.neu.edu>

( require unstable/mutated-vars)

This library is unstable; compatibility will not be maintained. See Unstable for more information.

( find-mutated-vars stx [dict]) → dict?
stx : syntax?
dict : dict? = ( make-immutable-free-id-table)

Traverses stx, which should be module-level-form in the sense of the grammar for fully-expanded forms, and records all of the variables that are mutated. Each mutated variable is added to dict, mapped to #t. If dict is mutable, as determined by dict-mutable?, then the table is updated destructively. Otherwise, the table is updated functionally.

Examples:
> ( define t ( find-mutated-vars #'( begin ( set! var 'foo) 'bar)))
> ( dict-ref t #'var #f)
#t
> ( dict-ref t #'other-var #f)
#f
> ( define tbl ( make-free-id-table))
> ( find-mutated-vars #'( begin ( set! var 'foo) 'bar) tbl)
#<mutable-free-id-table>
> ( dict-ref tbl #'var #f)
#t

}
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