Fixing #7479

Types converted:

- `NixStringContextElem`
- `OutputsSpec`
- `ExtendedOutputsSpec`
- `DerivationOutput`
- `DerivationType`

Existing ones mostly conforming the pattern cleaned up:

- `ContentAddressMethod`
- `ContentAddressWithReferences`

The `DerivationGoal::derivationType` field had a bogus initialization,
now caught, so I made it `std::optional`. I think #8829 can make it
non-optional again because it will ensure we always have the derivation
when we construct a `DerivationGoal`.

See that issue (#7479) for details on the general goal.

`git grep 'Raw::Raw'` indicates the two types I didn't yet convert
`DerivedPath` and `BuiltPath` (and their `Single` variants) . This is
because @roberth and I (can't find issue right now...) plan on reworking
them somewhat, so I didn't want to churn them more just yet.

Co-authored-by: Eelco Dolstra <edolstra@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcmd/installable-derived-path.cc b/src/libcmd/installable-derived-path.cc
index b45641e8a..4d1f83a1c 100644
--- a/src/libcmd/installable-derived-path.cc
+++ b/src/libcmd/installable-derived-path.cc
@@ -55,7 +55,7 @@ InstallableDerivedPath InstallableDerivedPath::parse(
                 .outputs = outputSpec,
             };
         },
-    }, extendedOutputsSpec.raw());
+    }, extendedOutputsSpec.raw);
     return InstallableDerivedPath {
         store,
         std::move(derivedPath),