e3a68e235c
This commit reinstates the requirement that the predicate in a "check" must be a manifest call to a special kind of function declared with the new "pred" keyword instead of "fn". Preds must have a boolean return type and can only call other preds; they can't have any effects (as enforced by the typechecker). The arguments to a predicate in a check expression must be slot variables or literals.
This is a compiler and suite of associated libraries and documentation for the Rust programming language. See LICENSE.txt for terms of copyright and redistribution. See http://github.com/graydon/rust for current development page.