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internal/typesinternal: document ReadGo116ErrorData 

Change-Id: I5afe3e4d3f137758da404e779d6bc9b0a57b6a02
Reviewed-on: https://go-review.googlesource.com/c/tools/+/351089
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
This commit is contained in:
Robert Findley 2021-09-20 15:14:52 -04:00
parent 91c880c34d
commit fe076c893b
1 changed files with 7 additions and 2 deletions
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9
internal/typesinternal/types.go
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@ -30,10 +30,15 @@ func SetUsesCgo(conf *types.Config) bool {
return true
}
func ReadGo116ErrorData(terr types.Error) (ErrorCode, token.Pos, token.Pos, bool) {
// ReadGo116ErrorData extracts additional information from types.Error values
// generated by Go version 1.16 and later: the error code, start position, and
// end position. If all positions are valid, start <= err.Pos <= end.
//
// If the data could not be read, the final result parameter will be false.
func ReadGo116ErrorData(err types.Error) (code ErrorCode, start, end token.Pos, ok bool) {
var data [3]int
// By coincidence all of these fields are ints, which simplifies things.
v := reflect.ValueOf(terr)
v := reflect.ValueOf(err)
for i, name := range []string{"go116code", "go116start", "go116end"} {
f := v.FieldByName(name)
if !f.IsValid() {