func defaultCheckNamedValue(nv *driver.NamedValue) (err error) {
	nv.Value, err = driver.DefaultParameterConverter.ConvertValue(nv.Value)
	return err
}

// driverArgsConnLocked converts arguments from callers of Stmt.Exec and
// Stmt.Query into driver Values.
//
// The statement ds may be nil, if no statement is available.
//
// ci must be locked.

		value = n
	case conv.Esc() == ir.EscNone && fromType.Size() <= 1024:
		// n does not escape. Use a stack temporary initialized to n.
		value = typecheck.TempAt(base.Pos, ir.CurFunc, fromType)
		init.Append(typecheck.Stmt(ir.NewAssignStmt(base.Pos, value, n)))
	}
	if value != nil {
		// The interface data word is &value.
		return typecheck.Expr(typecheck.NodAddr(value))
	}

	case ast.Expr:
		p.expr(n)
	case ast.Stmt:
		// A labeled statement will un-indent to position the label.
		// Set p.indent to 1 so we don't get indent "underflow".
		if _, ok := n.(*ast.LabeledStmt); ok {
			p.indent = 1
		}
		p.stmt(n, false)
	case ast.Decl:
		p.decl(n)
	case ast.Spec:
		p.spec(n, 1, false)
	case []ast.Stmt:
		// A labeled statement will un-indent to position the label.

// block and returns the suffix of its statements starting with the current
// node, along with the number of call expressions encountered.
func restOfBlock(stack []ast.Node) ([]ast.Stmt, int) {
	var ncalls int
	for i := len(stack) - 1; i >= 0; i-- {
		if b, ok := stack[i].(*ast.BlockStmt); ok {
			for j, v := range b.List {
				if v == stack[i+1] {
					return b.List[j:], ncalls
				}
			}

	//     21  .  .  .  .  .  Closing: 3:11
	//     22  .  .  .  .  }
	//     23  .  .  .  }
	//     24  .  .  .  Body: *ast.BlockStmt {
	//     25  .  .  .  .  Lbrace: 3:13
	//     26  .  .  .  .  List: []ast.Stmt (len = 1) {
	//     27  .  .  .  .  .  0: *ast.ExprStmt {
	//     28  .  .  .  .  .  .  X: *ast.CallExpr {
	//     29  .  .  .  .  .  .  .  Fun: *ast.Ident {
	//     30  .  .  .  .  .  .  .  .  NamePos: 4:2

				nif := ir.NewIfStmt(c.pos, s.okName, []ir.Node{c.jmp}, nil)
				clauses = append(clauses, typeClause{
					hash: types.TypeHash(c.typ.Type()),
					body: []ir.Node{typecheck.Stmt(as), typecheck.Stmt(nif)},
				})
			}
			s.flush(clauses, &sw.Compiled)
			concreteCases = concreteCases[:0]
		}

		// The "any" case, if it exists, must be the last interface case, because

		// terminated by a semicolon. Because semicolons may be omitted before
		// an _Rbrace, seeing an _Rbrace implies an empty statement.
		e := new(EmptyStmt)
		e.pos = p.pos()
		s.Stmt = e
		return s
	}

	s.Stmt = p.stmtOrNil()
	if s.Stmt != nil {
		return s
	}

	// report error at line of ':' token
	p.syntaxErrorAt(s.pos, "missing statement after label")

		for _, field := range node.List {
			u.node(field)
		}
	case *ast.Field:
		u.node(node.Type)

	// statements

	case *ast.BlockStmt:
		defer u.scoped()()
		for _, stmt := range node.List {
			u.node(stmt)
		}
	case *ast.DeclStmt:
		u.node(node.Decl)
	case *ast.IfStmt:
		if node.Init != nil {
			u.node(node.Init)
		}
		u.node(node.Cond)
		u.node(node.Body)

	callx := typecheck.Call(pos, fn, []ir.Node{mdauspx, lenx, hashx,
		pkPathNode, pkIdNode, cmodeNode, cgranNode}, false)
	assign := callx
	if pkid == coverage.NotHardCoded {
		assign = typecheck.Stmt(ir.NewAssignStmt(pos, cnames.PkgIdVar, callx))
	}

	// Tack the call onto the start of our init function. We do this
	// early in the init since it's possible that instrumented function

	case *ast.ChanType:
		f.walk(&n.Value, ctxType, visit)

	case *ast.BadStmt:
	case *ast.DeclStmt:
		f.walk(n.Decl, ctxDecl, visit)
	case *ast.EmptyStmt:
	case *ast.LabeledStmt:
		f.walk(n.Stmt, ctxStmt, visit)
	case *ast.ExprStmt:
		f.walk(&n.X, ctxExpr, visit)
	case *ast.SendStmt:
		f.walk(&n.Chan, ctxExpr, visit)
		f.walk(&n.Value, ctxExpr, visit)
	case *ast.IncDecStmt: