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Preserve empty variant constructor in data-deps. #7303

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merged 3 commits into from
Sep 2, 2020
Merged

Preserve empty variant constructor in data-deps. #7303

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31a694c
Preserve empty variant constructor in data-deps.
sofiafaro-da Sep 2, 2020
1cca2ae
Add special case for single constructor variants
sofiafaro-da Sep 2, 2020
59926ba
Add test for special case
sofiafaro-da Sep 2, 2020
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Add test for special case
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@sofiafaro-da
sofiafaro-da committed Sep 2, 2020
commit 59926babb9e698dbaa9e85ecabacd3d575c25df0
7 changes: 7 additions & 0 deletions compiler/damlc/tests/src/DA/Test/Packaging.hs
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Expand Up @@ -1682,6 +1682,7 @@ dataDependencyTests Tools{damlc,repl,validate,davlDar,oldProjDar} = testGroup "D
writeFileUTF8 (tmpDir </> "type" </> "Foo.daml") $ unlines
[ "module Foo where"
, "data A = B | C Int"
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Should we add a third case D () and check that it behaves like D when imported as data-dependency?

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I don't think so. D () is something we're deprecating, and the fact that it's treated the same as D in the current compiler is mostly a mistake.

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I generally agree but would feel more comfortable to have a test as long as users can still write it, even though they get warned about it.

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@sofiafaro-da sofiafaro-da Sep 2, 2020 •
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I added a test for D () in the single constructor case, which is something we had talked about adding as a special case (since we can't distinguish single-constructor variants from enums any other way, and there's no ambiguity in the single constructor case). (This actually also came up in one of the other tests, but better to add one here as well.)

, "data D = D ()" -- single-constructor case uses explicit unit
]
withCurrentDirectory (tmpDir </> "type") $
callProcessSilent damlc ["build", "-o", "type.dar"]
Expand All @@ -1707,6 +1708,12 @@ dataDependencyTests Tools{damlc,repl,validate,davlDar,oldProjDar} = testGroup "D
, " case a of"
, " B -> 0"
, " C n -> n"
, "mkD : D"
, "mkD = D ()"
, "matchD : D -> ()"
, "matchD d ="
, " case d of"
, " D () -> ()"
]
withCurrentDirectory (tmpDir </> "proj") $
callProcessSilent damlc ["build"]
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