cmm common block not eliminated

For the toTuple# function (in the attached file) GHC generates a cmm switch statement, with all the alternatives, unsurprisingly, the same. Yet, cmm common block elimination does not kick in.

In this particular example, the whole case statement could be annihilated, because all alternatives lead to the same code.

BTW, this is how they match in France.

type alt = A of int | B of int | C of int | D of int
let g x = match x with A v | B v  | C v | D v -> v

Trac metadata

Trac field	Value
Version	7.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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