internal/encoding: don't simplify interpreted encodings

As this will cause file information to be lost.

The effect is relatively minor.

Change-Id: I25367088b202118ac16d24c3363f0c19553480a2
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/6301
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
Reviewed-by: Johan Euphrosine <proppy@google.com>

cmd/cue/cmd/testdata/script/def_jsonschema.txt

@@ -69,10 +69,8 @@ age: twenty
 
 -- expect-stderr2 --
 age: conflicting values "twenty" and >=0 (mismatched types string and number):
-    14:7
     ./data.yaml:1:7
 -- expect-stderr3 --
 age: conflicting values "twenty" and >=0 (mismatched types string and number):
-    14:7
     ./data.yaml:1:7
 -- cue.mod --

cmd/cue/cmd/testdata/script/import_auto.txt

@@ -2,6 +2,8 @@ cue import -o - ./openapi.yaml
 cmp stdout expect-openapi
 
 -- expect-openapi --
+
+
 // An OpenAPI file
 
 info: {

internal/encoding/encoding.go

@@ -267,15 +267,19 @@ func jsonSchemaFunc(cfg *Config, f *build.File) interpretFunc {
 
 			Strict: cfg.Strict,
 		}
-		file, err = simplify(jsonschema.Extract(i, cfg))
+		file, err = jsonschema.Extract(i, cfg)
+		// TODO: simplify currently erases file line info. Reintroduce after fix.
+		// file, err = simplify(file, err)
 		return file, id, err
 	}
 }
 
 func openAPIFunc(c *Config, f *build.File) interpretFunc {
 	cfg := &openapi.Config{PkgName: c.PkgName}
 	return func(i *cue.Instance) (file *ast.File, id string, err error) {
-		file, err = simplify(openapi.Extract(i, cfg))
+		file, err = openapi.Extract(i, cfg)
+		// TODO: simplify currently erases file line info. Reintroduce after fix.
+		// file, err = simplify(file, err)
 		return file, "", err
 	}
 }
@@ -431,6 +435,8 @@ func simplify(f *ast.File, err error) (*ast.File, error) {
 	if err != nil {
 		return nil, err
 	}
+	// This needs to be a function that modifies f in order to maintain line
+	// number information.
 	b, err := format.Node(f, format.Simplify())
 	if err != nil {
 		return nil, err