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classes.union: Disallow unions to refer to themselves. Fixes #420 lol. Thanks @mrjbq7 for the patch.

db4
Doug Coleman 2013-03-23 13:17:29 -07:00
parent a55a367bf3
commit 980d5f44b2
2 changed files with 10 additions and 1 deletions
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4
core/classes/union/union-tests.factor
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@ -132,3 +132,7 @@ PREDICATE: numba-ova-10 < union{ float integer }
[ t ] [ 100.0 numba-ova-10? ] unit-test
[ f ] [ 5 numba-ova-10? ] unit-test
[ f ] [ 5.75 numba-ova-10? ] unit-test
! Issue #420 lol
[ "IN: issue-420 UNION: omg omg ;" eval( -- ) ]
[ error>> cannot-reference-self? ] must-fail-with

7
core/classes/union/union.factor
View File

@ -53,10 +53,15 @@ M: union-class update-class define-union-predicate ;
: (define-union-class) ( class members -- )
f swap f union-class make-class-props (define-class) ;
ERROR: cannot-reference-self class members ;
: check-self-reference ( class members -- class members )
2dup member-eq? [ cannot-reference-self ] when ;
PRIVATE>
: define-union-class ( class members -- )
[ (define-union-class) ]
[ check-self-reference (define-union-class) ]
[ drop changed-conditionally ]
[ drop update-classes ]
2tri ;