const unicode.ReplacementChar

5 uses

	unicode (current package)
		letter.go#L11: 	ReplacementChar = '\uFFFD'     // Represents invalid code points.
		letter.go#L213: 		return ReplacementChar, false // as reasonable an error as any

	encoding/json
		decode.go#L1261: 					if dec := utf16.DecodeRune(rr, rr1); dec != unicode.ReplacementChar {
		decode.go#L1268: 					rr = unicode.ReplacementChar

	mime
		encodedword.go#L326: 				buf.WriteRune(unicode.ReplacementChar)

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