idUnfoldingVars :: Id -> VarSet
-- Produce free vars for an unfolding, but NOT for an ordinary
-- (non-inline) unfolding, since it is a dup of the rhs
+-- and we'll get exponential behaviour if we look at both unf and rhs!
+-- But do look at the *real* unfolding, even for loop breakers, else
+-- we might get out-of-scope variables
idUnfoldingVars id
- = case idUnfolding id of
- CoreUnfolding { uf_tmpl = rhs, uf_guidance = InlineRule {} }
+ = case realIdUnfolding id of
+ CoreUnfolding { uf_tmpl = rhs, uf_src = src }
+ | isInlineRuleSource src
-> exprFreeVars rhs
DFunUnfolding _ args -> exprsFreeVars args
_ -> emptyVarSet