James Eversole
1d84bf7cfa
freeVars did not descend into TStem, TFork, or SList, so dependency analysis under structural nodes and lists was silently missed. toSKIDB's _other = _K `SApp` TLeaf fallback returned a constant leaf when the binder occurred under a structural node, losing the abstraction entirely. Replace with explicit lowering: BStem/BFork/BList are converted to application form before SKI abstraction, and any other unsupported DB term errors explicitly