cue: remove unneeded fields from goField

These were carried over from JSON, where they are used
to efficiently encode the fields as JSON keys repeatedly.
Here we don't deal with JSON encoding or decoding at all.

Signed-off-by: Daniel Martí <[email protected]>
Change-Id: Ifa86da924cf261a86ba58f3e888c294f450e49f7
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1201761
Unity-Result: CUE porcuepine <[email protected]>
Reviewed-by: Roger Peppe <[email protected]>
TryBot-Result: CUEcueckoo <[email protected]>

cue/decode.go

@@ -480,9 +480,6 @@ type goField struct {
 	nameBytes []byte                 // []byte(name)
 	equalFold func(s, t []byte) bool // bytes.EqualFold or equivalent
 
-	nameNonEsc  string // `"` + name + `":`
-	nameEscHTML string // `"` + HTMLEscape(name) + `":`
-
 	tag       bool
 	index     []int
 	typ       reflect.Type
@@ -518,9 +515,6 @@ func typeFields(t reflect.Type) structFields {
 	// Fields found.
 	var fields []goField
 
-	// Buffer to run HTMLEscape on field names.
-	var nameEscBuf bytes.Buffer
-
 	for len(next) > 0 {
 		current, next = next, current[:0]
 		count, nextCount = nextCount, map[reflect.Type]int{}
@@ -584,14 +578,6 @@ func typeFields(t reflect.Type) structFields {
 					field.nameBytes = []byte(field.name)
 					field.equalFold = foldFunc(field.nameBytes)
 
-					// Build nameEscHTML and nameNonEsc ahead of time.
-					nameEscBuf.Reset()
-					nameEscBuf.WriteString(`"`)
-					json.HTMLEscape(&nameEscBuf, field.nameBytes)
-					nameEscBuf.WriteString(`":`)
-					field.nameEscHTML = nameEscBuf.String()
-					field.nameNonEsc = `"` + field.name + `":`
-
 					fields = append(fields, field)
 					if count[f.typ] > 1 {
 						// If there were multiple instances, add a second,