FWIW, I fixed some code paths (locally) in the compiler before to not panic when using the `HsTick` constructor as I wanted to generate some code using Template Haskell which contained source notes. This was useful for me for debugging a big explosion in code generation size. On Mon, Apr 13, 2020 at 5:50 PM Krzysztof Gogolewski wrote:

I confirm. I added this in the description of https://gitlab.haskell.org/ghc/ghc/issues/16830. Krzysztof

On Mon, Apr 13, 2020 at 1:00 PM Simon Peyton Jones via ghc-devs wrote:

...

Friends

I think HsTick and HsBinTick are added (only) by GHC.HsToCore.Coverage

So I think the cannot occur in HsExpr GhcPs or HcExpr GhcRn

If so we should change the data type decl to say this explicitly.

Can anyone confirm or deny and add a ticket if so?

Simon

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