case 'x':
		return "hexadecimal literal"
	case 'o', '0':
		return "octal literal"
	case 'b':
		return "binary literal"
	}
}

// invalidSep returns the index of the first invalid separator in x, or -1.
func invalidSep(x string) int {
	x1 := ' ' // prefix char, we only care if it's 'x'
	d := '.'  // digit, one of '_', '0' (a digit), or '.' (anything else)
	i := 0

	// a prefix counts as a digit

	case 'o', '0':
		return "octal literal"
	case 'b':
		return "binary literal"
	}
	return "decimal literal"
}

// invalidSep returns the index of the first invalid separator in x, or -1.
func invalidSep(x string) int {
	x1 := ' ' // prefix char, we only care if it's 'x'
	d := '.'  // digit, one of '_', '0' (a digit), or '.' (anything else)
	i := 0

	// a prefix counts as a digit
	if len(x) >= 2 && x[0] == '0' {

	_ = x[InvalidDotDotDotOperand-80]
	_ = x[InvalidDotDotDot-81]
	_ = x[UncalledBuiltin-82]
	_ = x[InvalidAppend-83]
	_ = x[InvalidCap-84]
	_ = x[InvalidClose-85]
	_ = x[InvalidCopy-86]
	_ = x[InvalidComplex-87]
	_ = x[InvalidDelete-88]
	_ = x[InvalidImag-89]
	_ = x[InvalidLen-90]
	_ = x[SwappedMakeArgs-91]
	_ = x[InvalidMake-92]
	_ = x[InvalidReal-93]
	_ = x[InvalidAssert-94]
	_ = x[ImpossibleAssert-95]

	_ = x[MisplacedDotDotDot-79]
	_ = x[InvalidDotDotDot-81]
	_ = x[UncalledBuiltin-82]
	_ = x[InvalidAppend-83]
	_ = x[InvalidCap-84]
	_ = x[InvalidClose-85]
	_ = x[InvalidCopy-86]
	_ = x[InvalidComplex-87]
	_ = x[InvalidDelete-88]
	_ = x[InvalidImag-89]
	_ = x[InvalidLen-90]
	_ = x[SwappedMakeArgs-91]
	_ = x[InvalidMake-92]
	_ = x[InvalidReal-93]
	_ = x[InvalidAssert-94]
	_ = x[ImpossibleAssert-95]

				return false
			}) {
				mode = value
			}
		}

		if mode == invalid {
			// avoid error if underlying type is invalid
			if isValid(under(x.typ)) {
				code := InvalidCap
				if id == _Len {
					code = InvalidLen
				}
				check.errorf(x, code, invalidArg+"%s for built-in %s", x, bin.name)
			}
			return
		}

		// record the signature before changing x.typ

				return false
			}) {
				mode = value
			}
		}

		if mode == invalid {
			// avoid error if underlying type is invalid
			if isValid(under(x.typ)) {
				code := InvalidCap
				if id == _Len {
					code = InvalidLen
				}
				check.errorf(x, code, invalidArg+"%s for built-in %s", x, bin.name)
			}
			return
		}

		// record the signature before changing x.typ

	case nil:
		check.errorf(x, NonSliceableOperand, invalidOp+"cannot slice %s: %s has no core type", x, x.typ)
		x.mode = invalid
		return

	case *Basic:
		if isString(u) {
			if e.Slice3 {
				at := e.Max
				if at == nil {
					at = e // e.Index[2] should be present but be careful
				}
				check.error(at, InvalidSliceExpr, invalidOp+"3-index slice of string")
				x.mode = invalid
				return
			}

			check.errorf(x, UnaddressableOperand, invalidOp+"cannot take address of %s", x)
			x.mode = invalid
			return
		}
		x.mode = value
		x.typ = &Pointer{base: x.typ}
		return

	case token.ARROW:
		u := coreType(x.typ)
		if u == nil {
			check.errorf(x, InvalidReceive, invalidOp+"cannot receive from %s (no core type)", x)
			x.mode = invalid
			return
		}

				tc.ResponseRecorder.LogErrBody = true
			}

			defer logger.AuditLog(r.Context(), w, r, mustGetClaimsFromToken(r))
			invalidReq := errorCodes.ToAPIErr(ErrInvalidRequest)
			invalidReq.Description = fmt.Sprintf("%s (%s)", invalidReq.Description, err)
			writeErrorResponse(r.Context(), w, invalidReq, r.URL)
			atomic.AddUint64(&globalHTTPStats.rejectedRequestsInvalid, 1)
			return
		}

	expectInvalidKey("Create", store.Create(ctx, invalidKey, nil, nil, 0))
	expectInvalidKey("Delete", store.Delete(ctx, invalidKey, nil, nil, nil, nil))
	_, watchErr := store.Watch(ctx, invalidKey, storage.ListOptions{})
	expectInvalidKey("Watch", watchErr)
	expectInvalidKey("Get", store.Get(ctx, invalidKey, storage.GetOptions{}, nil))
	expectInvalidKey("GetList", store.GetList(ctx, invalidKey, storage.ListOptions{}, nil))