libexpr: remove dynamic derivation eval support

Change-Id: I8bbdaa280f634bafd5abd7034a605564f45978c0

lix/libexpr/builtins/outputOf.md

@@ -1,23 +0,0 @@
----
-name: outputOf
-args: [derivation-reference, output-name]
-experimentalFeature: dynamic-derivations
----
-Return the output path of a derivation, literally or using a placeholder if needed.
-
-If the derivation has a statically-known output path (i.e. the derivation output is input-addressed, or fixed content-addressed), the output path will just be returned.
-But if the derivation is content-addressed or if the derivation is itself not-statically produced (i.e. is the output of another derivation), a placeholder will be returned instead.
-
-*`derivation reference`* must be a string that may contain a regular store path to a derivation, or may be a placeholder reference. If the derivation is produced by a derivation, you must explicitly select `drv.outPath`.
-This primop can be chained arbitrarily deeply.
-For instance,
-
-```nix
-builtins.outputOf
-  (builtins.outputOf myDrv "out)
-  "out"
-```
-
-will return a placeholder for the output of the output of `myDrv`.
-
-This primop corresponds to the `^` sigil for derivable paths, e.g. as part of installable syntax on the command line.

lix/libexpr/meson.build

@@ -115,7 +115,6 @@ builtin_definitions = files(
   'builtins/mapAttrs.md',
   'builtins/match.md',
   'builtins/mul.md',
-  'builtins/outputOf.md',
   'builtins/parseDrvName.md',
   'builtins/parseFlakeRef.md',
   'builtins/partition.md',

lix/libexpr/primops.cc

@@ -1390,21 +1390,6 @@ static void prim_readDir(EvalState & state, Value * * args, Value & v)
     v.mkAttrs(attrs);
 }
 
-/* Extend single element string context with another output. */
-static void prim_outputOf(EvalState & state, Value * * args, Value & v)
-{
-    SingleDerivedPath drvPath = state.coerceToSingleDerivedPath(noPos, *args[0], "while evaluating the first argument to builtins.outputOf");
-
-    OutputNameView outputName = state.forceStringNoCtx(*args[1], noPos, "while evaluating the second argument to builtins.outputOf");
-
-    state.mkSingleDerivedPathString(
-        SingleDerivedPath::Built {
-            .drvPath = make_ref<SingleDerivedPath>(drvPath),
-            .output = std::string { outputName },
-        },
-        v);
-}
-
 /*************************************************************
  * Creating files
  *************************************************************/

lix/nix/main.cc

@@ -516,8 +516,7 @@ void mainWrapped(AsyncIoRoot & aio, int argc, char * * argv)
     if (argc == 2 && std::string(argv[1]) == "__dump-language") {
         experimentalFeatureSettings.experimentalFeatures.override(ExperimentalFeatures{}
             | Xp::Flakes
-            | Xp::FetchClosure
-            | Xp::DynamicDerivations);
+            | Xp::FetchClosure);
         evalSettings.pureEval.override(false);
         Evaluator state(aio, {}, aio.blockOn(openStore("dummy://")));
         auto res = JSON::object();