e1620def9f
A check in trans didn't have a corresponding check in typeck, causing some programs (to wit, compile-fail/chan-parameterized-args.rs - part of this commit) to fail with an assertion failure in trans instead of a type error. Fixed it. In short, arguments that are future thunk arguments (any spawn arguments, and _ arguments in bind) need to either not contain type params or type vars, or be by-reference. Closes #665.
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