if (map != null) {
                synonymMap = map;
                fst = synonymMap.fst;
                if (fst == null) {
                    throw new IllegalArgumentException("fst must be non-null");
                }
                fstReader = fst.getBytesReader();
                scratchArc = new FST.Arc<>();
                clearAttributes();
            }
        }
    }

// source position in path. path must not be empty.
func firstInSrc(path []Object) int {
	fst, pos := 0, path[0].Pos()
	for i, t := range path[1:] {
		if cmpPos(t.Pos(), pos) < 0 {
			fst, pos = i+1, t.Pos()
		}
	}
	return fst
}

func (check *Checker) constDecl(obj *Const, typ, init syntax.Expr, inherited bool) {
	assert(obj.typ == nil)

// source position in path. path must not be empty.
func firstInSrc(path []Object) int {
	fst, pos := 0, path[0].Pos()
	for i, t := range path[1:] {
		if cmpPos(t.Pos(), pos) < 0 {
			fst, pos = i+1, t.Pos()
		}
	}
	return fst
}

type (
	decl interface {
		node() ast.Node
	}

	importDecl struct{ spec *ast.ImportSpec }
	constDecl  struct {

			args = append(args, "st0")
		}

	case FPTAN, FSINCOS, FUCOMPP, FCOMPP, FYL2X, FPATAN, FXTRACT, FPREM1, FPREM, FYL2XP1, FSCALE:
		if len(args) == 0 {
			args = []string{"st0", "st1"}
		}

	case FST, FSTP, FISTTP, FIST, FISTP, FBSTP:
		if len(args) == 1 {
			args = append(args, "st0")
		}

	}
	return regBytes(arg)
}

func isFloat(op Op) bool {
	switch op {
	case FADD, FCOM, FCOMP, FDIV, FDIVR, FIADD, FICOM, FICOMP, FIDIV, FIDIVR, FILD, FIMUL, FIST, FISTP, FISTTP, FISUB, FISUBR, FLD, FMUL, FST, FSTP, FSUB, FSUBR:
		return true
	}
	return false
}

func isFloatInt(op Op) bool {
	switch op {
	case FIADD, FICOM, FICOMP, FIDIV, FIDIVR, FILD, FIMUL, FIST, FISTP, FISTTP, FISUB, FISUBR:
		return true

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