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bc2cf531e3
The optimizer reduces the variables with a known type to #t in a Boolean context. But some predicates imply that the variable has a definite values, so they can be reduced in a non-Boolean context too. For example, in (lambda (x) (if (null? x) x 0))) reduce the last x ==> null. |
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This is the source code for the main Racket distribution. See "INSTALL.txt" for information on building Racket. License ------- Racket Copyright (c) 2010-2014 PLT Design Inc. Racket is distributed under the GNU Lesser General Public License (LGPL). This implies that you may link Racket into proprietary applications, provided you follow the rules stated in the LGPL. You can also modify Racket; if you distribute a modified version, you must distribute it under the terms of the LGPL, which in particular states that you must release the source code for the modified software. See racket/src/COPYING_LESSER.txt for more information.