[project @ 2002-01-24 16:55:04 by sewardj]
This is one of those commits where the commit message is hundreds of times, in bytes, larger than the fix. If you count pixels, it's probably more like thousands of times larger, since the fix involves adding a missing apostrophe. In compiling let bindings, when filtering the free vars of each RHS against the supplied on-stack environment p, filter against p after it has been augmented with the binders in this let (viz, p'), rather than before. Without this, letrec-bound binders can never "get started" in the environment. This fixes the HEAD crash for [(i,1) | i <- ]. Stable branch is ok since the free-var machinery works a different way there.