Fix #10493.
Now, a Coercible (T1 ...) (T2 ...) constraint is insoluble only when both T1 and T2 say "yes" to isDistinctTyCon. Several comments also updated in this patch.
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Now, a Coercible (T1 ...) (T2 ...) constraint is insoluble only when both T1 and T2 say "yes" to isDistinctTyCon. Several comments also updated in this patch.