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Correctly manipulating program terms in a compiler is surprisingly difficultbecause of the need to avoid name capture. The rapier from "Secrets of theGlasgow Haskell Compiler inliner" is a cutting-edge technique for fast,stateless capture-avoiding substitution for expressions represented withexplicit names. It is, however, a sharp tool: its invariants are tricky andneed to be maintained throughout the whole compiler that uses it. We describethe foil, an elaboration of the rapier that uses Haskell's type system toenforce the rapier's invariants statically, preventing a class of hard-to-findbugs, but without adding any run-time overheads.

The Foil: Capture-Avoiding Substitution With No Sharp Edges