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Simon Peyton Jones authored
Trac #14270 showed that SpecConstr could cause nasty Lint failures if it generates a RULE that binds coercion varables. See * Note [SpecConstr and casts], and * the test simplCore/should_compile/T14270. This doesn't feel like the final word to me, because somehow the specialisation "ought" to work. So I left in a debug WARN to yell if the new check acutally fires. Meanwhile, it stops the erroneous specialisation. binding coercion
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