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Simon Peyton Jones authored
The tcg_dus field used to contain *uses* of type and class decls, but not *defs*. That was inconsistent, and it really went wrong for Template Haskell bracket. What happened was that foo = [d| data A = A f :: A -> A f x = x |] would find a "use" of A when processing the top level of the module, which in turn led to a mkUsageInfo panic in MkIface. The cause was the fact that the tcg_dus for the nested quote didn't have defs for A.
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