cuecontext: revert support for CUE_EXPERIMENT

We are unsure about the right API for experiments
as of yet and we probably have something
better.

Signed-off-by: Marcel van Lohuizen <[email protected]>
Change-Id: I437cad0b8ff38a0af4ac41cbe8357c51a0373f71
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1217084
TryBot-Result: CUEcueckoo <[email protected]>
Unity-Result: CUE porcuepine <[email protected]>
Reviewed-by: Daniel Martí <[email protected]>

Author: mpvl

cue/cuecontext/cuecontext.go

@@ -22,7 +22,6 @@ import (
 	"cuelang.org/go/internal"
 	"cuelang.org/go/internal/core/runtime"
 	"cuelang.org/go/internal/cuedebug"
-	"cuelang.org/go/internal/cueexperiment"
 	"cuelang.org/go/internal/envflag"
 
 	_ "cuelang.org/go/pkg"
@@ -109,17 +108,3 @@ func CUE_DEBUG(s string) Option {
 		r.SetDebugOptions(&c)
 	}}
 }
-
-// CUE_EXPERIMENT takes a string with the same contents as CUE_EXPERIMENT and
-// configures the context with the relevant debug options. It panics for unknown
-// or malformed options.
-func CUE_EXPERIMENT(s string) Option {
-	var c cueexperiment.Config
-	if err := envflag.Parse(&c, s); err != nil {
-		panic(fmt.Errorf("cuecontext.CUE_DEBUG: %v", err))
-	}
-
-	return Option{func(r *runtime.Runtime) {
-		r.SetGlobalExperiments(&c)
-	}}
-}

internal/core/runtime/runtime.go

@@ -100,13 +100,11 @@ func (r *Runtime) SetDebugOptions(flags *cuedebug.Config) {
 }
 
 // SetGlobalExperiments that apply to language evaluation.
+// It does not set the version.
 func (r *Runtime) SetGlobalExperiments(flags *cueexperiment.Config) {
 	r.simplifyValidators = !flags.KeepValidators
-	if flags.EvalV3 {
-		r.SetVersion(internal.EvalV3)
-	} else {
-		r.SetVersion(internal.EvalV2)
-	}
+	// Do not set version as this is already set by NewWithSettings or
+	// SetVersion.
 }
 
 // IsInitialized reports whether the runtime has been initialized.