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cmd/compile/internal/syntax: establish principled position information

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Until now, the parser set the position for each Node to the position of
the first token belonging to that node. For compatibility with the now
defunct gc parser, in many places that position information was modified
when the gcCompat flag was set (which it was, by default). Furthermore,
in some places, position information was not set at all.

This change removes the gcCompat flag and all associated code, and sets
position information for all nodes in a more principled way, as proposed
by mdempsky (see #16943 for details). Specifically, the position of a
node may not be at the very beginning of the respective production. For
instance for an Operation `a + b`, the position associated with the node
is the position of the `+`. Thus, for `a + b + c` we now get different
positions for the two additions.

This change does not pass toolstash -cmp because position information
recorded in export data and pcline tables is different. There are no
other functional changes.

Added test suite testing the position of all nodes.

Fixes #16943.

Change-Id: I3fc02bf096bc3b3d7d2fa655dfd4714a1a0eb90c
Reviewed-on: https://go-review.googlesource.com/37017
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Robert Griesemer 2017-02-13 16:00:53 -08:00
parent 6910756f9b
commit 5267ac2732
4 changed files with 466 additions and 172 deletions
Download patch file Download diff file Expand all files Collapse all files

295
src/cmd/compile/internal/syntax/parser.go
View file

@ -15,11 +15,6 @@ import (
const debug = false
const trace = false
// The old gc parser assigned line numbers very inconsistently depending
// on when it happened to construct AST nodes. To make transitioning to the
// new AST easier, we try to mimick the behavior as much as possible.
const gcCompat = true
type parser struct {
base *src.PosBase
errh ErrorHandler
@ -248,7 +243,7 @@ func (p *parser) file() *File {
}
f := new(File)
f.init(p)
f.pos = p.pos()
// PackageClause
if !p.got(_Package) {
@ -346,14 +341,14 @@ func (p *parser) importDecl(group *Group) Decl {
}
d := new(ImportDecl)
d.init(p)
d.pos = p.pos()
switch p.tok {
case _Name:
d.LocalPkgName = p.name()
case _Dot:
n := new(Name)
n.init(p)
n.pos = p.pos()
n.Value = "."
d.LocalPkgName = n
p.next()
@ -376,7 +371,7 @@ func (p *parser) constDecl(group *Group) Decl {
}
d := new(ConstDecl)
d.init(p)
d.pos = p.pos()
d.NameList = p.nameList(p.name())
if p.tok != _EOF && p.tok != _Semi && p.tok != _Rparen {
@ -397,7 +392,7 @@ func (p *parser) typeDecl(group *Group) Decl {
}
d := new(TypeDecl)
d.init(p)
d.pos = p.pos()
d.Name = p.name()
d.Alias = p.got(_Assign)
@ -419,7 +414,7 @@ func (p *parser) varDecl(group *Group) Decl {
}
d := new(VarDecl)
d.init(p)
d.pos = p.pos()
d.NameList = p.nameList(p.name())
if p.got(_Assign) {
@ -431,9 +426,6 @@ func (p *parser) varDecl(group *Group) Decl {
}
}
d.Group = group
if gcCompat {
d.init(p)
}
return d
}
@ -449,7 +441,7 @@ func (p *parser) funcDecl() *FuncDecl {
}
f := new(FuncDecl)
f.init(p)
f.pos = p.pos()
badRecv := false
if p.tok == _Lparen {
@ -488,9 +480,6 @@ func (p *parser) funcDecl() *FuncDecl {
f.Name = p.name()
f.Type = p.funcType()
if gcCompat {
f.node = f.Type.node
}
f.Body = p.funcBody()
f.Pragma = p.pragma
@ -525,15 +514,12 @@ func (p *parser) binaryExpr(prec int) Expr {
x := p.unaryExpr()
for (p.tok == _Operator || p.tok == _Star) && p.prec > prec {
t := new(Operation)
t.init(p)
t.pos = p.pos()
t.Op = p.op
t.X = x
tprec := p.prec
p.next()
t.Y = p.binaryExpr(tprec)
if gcCompat {
t.init(p)
}
x = t
}
return x
@ -550,20 +536,17 @@ func (p *parser) unaryExpr() Expr {
switch p.op {
case Mul, Add, Sub, Not, Xor:
x := new(Operation)
x.init(p)
x.pos = p.pos()
x.Op = p.op
p.next()
x.X = p.unaryExpr()
if gcCompat {
x.init(p)
}
return x
case And:
p.next()
x := new(Operation)
x.init(p)
x.pos = p.pos()
x.Op = And
p.next()
// unaryExpr may have returned a parenthesized composite literal
// (see comment in operand) - remove parentheses if any
x.X = unparen(p.unaryExpr())
@ -572,6 +555,7 @@ func (p *parser) unaryExpr() Expr {
case _Arrow:
// receive op (<-x) or receive-only channel (<-chan E)
pos := p.pos()
p.next()
// If the next token is _Chan we still don't know if it is
@ -620,7 +604,11 @@ func (p *parser) unaryExpr() Expr {
}
// x is not a channel type => we have a receive op
return &Operation{Op: Recv, X: x}
o := new(Operation)
o.pos = pos
o.Op = Recv
o.X = x
return o
}
// TODO(mdempsky): We need parens here so we can report an
@ -636,7 +624,7 @@ func (p *parser) callStmt() *CallStmt {
}
s := new(CallStmt)
s.init(p)
s.pos = p.pos()
s.Tok = p.tok // _Defer or _Go
p.next()
@ -672,6 +660,7 @@ func (p *parser) operand(keep_parens bool) Expr {
return p.oliteral()
case _Lparen:
pos := p.pos()
p.next()
p.xnest++
x := p.expr() // expr_or_type
@ -700,21 +689,27 @@ func (p *parser) operand(keep_parens bool) Expr {
// in a go/defer statement. In that case, operand is called
// with keep_parens set.
if keep_parens {
x = &ParenExpr{X: x}
px := new(ParenExpr)
px.pos = pos
px.X = x
x = px
}
return x
case _Func:
pos := p.pos()
p.next()
t := p.funcType()
if p.tok == _Lbrace {
p.fnest++
p.xnest++
f := new(FuncLit)
f.init(p)
f.pos = pos
f.Type = t
f.Body = p.funcBody()
f.EndLine = p.line
p.xnest--
p.fnest--
return f
@ -767,6 +762,7 @@ func (p *parser) pexpr(keep_parens bool) Expr {
loop:
for {
pos := p.pos()
switch p.tok {
case _Dot:
p.next()
@ -774,7 +770,7 @@ loop:
case _Name:
// pexpr '.' sym
t := new(SelectorExpr)
t.init(p)
t.pos = pos
t.X = x
t.Sel = p.name()
x = t
@ -783,12 +779,12 @@ loop:
p.next()
if p.got(_Type) {
t := new(TypeSwitchGuard)
t.init(p)
t.pos = pos
t.X = x
x = t
} else {
t := new(AssertExpr)
t.init(p)
t.pos = pos
t.X = x
t.Type = p.expr()
x = t
@ -799,9 +795,6 @@ loop:
p.syntax_error("expecting name or (")
p.advance(_Semi, _Rparen)
}
if gcCompat && x != nil {
x.init(p)
}
case _Lbrack:
p.next()
@ -813,7 +806,7 @@ loop:
if p.got(_Rbrack) {
// x[i]
t := new(IndexExpr)
t.init(p)
t.pos = pos
t.X = x
t.Index = i
x = t
@ -824,7 +817,7 @@ loop:
// x[i:...
t := new(SliceExpr)
t.init(p)
t.pos = pos
t.X = x
t.Index[0] = i
p.want(_Colon)
@ -909,7 +902,7 @@ func (p *parser) complitexpr() *CompositeLit {
}
x := new(CompositeLit)
x.init(p)
x.pos = p.pos()
p.want(_Lbrace)
p.xnest++
@ -917,15 +910,13 @@ func (p *parser) complitexpr() *CompositeLit {
for p.tok != _EOF && p.tok != _Rbrace {
// value
e := p.bare_complitexpr()
if p.got(_Colon) {
if p.tok == _Colon {
// key ':' value
l := new(KeyValueExpr)
l.init(p)
l.pos = p.pos()
p.next()
l.Key = e
l.Value = p.bare_complitexpr()
if gcCompat {
l.init(p)
}
e = l
x.NKeys++
}
@ -954,13 +945,17 @@ func (p *parser) type_() Expr {
return typ
}
p.syntax_error("")
p.syntax_error("expecting type")
p.advance()
return nil
}
func indirect(typ Expr) Expr {
return &Operation{Op: Mul, X: typ}
func indirect(pos src.Pos, typ Expr) Expr {
o := new(Operation)
o.pos = pos
o.Op = Mul
o.X = typ
return o
}
// tryType is like type_ but it returns nil if there was no type
@ -975,18 +970,19 @@ func (p *parser) tryType() Expr {
defer p.trace("tryType")()
}
pos := p.pos()
switch p.tok {
case _Star:
// ptrtype
p.next()
return indirect(p.type_())
return indirect(pos, p.type_())
case _Arrow:
// recvchantype
p.next()
p.want(_Chan)
t := new(ChanType)
t.init(p)
t.pos = pos
t.Dir = RecvOnly
t.Elem = p.chanElem()
return t
@ -1005,14 +1001,14 @@ func (p *parser) tryType() Expr {
// []T
p.xnest--
t := new(SliceType)
t.init(p)
t.pos = pos
t.Elem = p.type_()
return t
}
// [n]T
t := new(ArrayType)
t.init(p)
t.pos = pos
if !p.got(_DotDotDot) {
t.Len = p.expr()
}
@ -1026,7 +1022,7 @@ func (p *parser) tryType() Expr {
// _Chan _Comm ntype
p.next()
t := new(ChanType)
t.init(p)
t.pos = pos
if p.got(_Arrow) {
t.Dir = SendOnly
}
@ -1038,7 +1034,7 @@ func (p *parser) tryType() Expr {
p.next()
p.want(_Lbrack)
t := new(MapType)
t.init(p)
t.pos = pos
t.Key = p.type_()
p.want(_Rbrack)
t.Value = p.type_()
@ -1069,12 +1065,10 @@ func (p *parser) funcType() *FuncType {
}
typ := new(FuncType)
typ.init(p)
typ.pos = p.pos()
typ.ParamList = p.paramList()
typ.ResultList = p.funcResult()
if gcCompat {
typ.init(p)
}
return typ
}
@ -1097,9 +1091,10 @@ func (p *parser) dotname(name *Name) Expr {
defer p.trace("dotname")()
}
if p.got(_Dot) {
if p.tok == _Dot {
s := new(SelectorExpr)
s.init(p)
s.pos = p.pos()
p.next()
s.X = name
s.Sel = p.name()
return s
@ -1114,7 +1109,7 @@ func (p *parser) structType() *StructType {
}
typ := new(StructType)
typ.init(p)
typ.pos = p.pos()
p.want(_Struct)
p.want(_Lbrace)
@ -1136,7 +1131,7 @@ func (p *parser) interfaceType() *InterfaceType {
}
typ := new(InterfaceType)
typ.init(p)
typ.pos = p.pos()
p.want(_Interface)
p.want(_Lbrace)
@ -1183,9 +1178,10 @@ func (p *parser) funcResult() []*Field {
return p.paramList()
}
pos := p.pos()
if result := p.tryType(); result != nil {
f := new(Field)
f.init(p)
f.pos = pos
f.Type = result
return []*Field{f}
}
@ -1193,7 +1189,7 @@ func (p *parser) funcResult() []*Field {
return nil
}
func (p *parser) addField(styp *StructType, name *Name, typ Expr, tag *BasicLit) {
func (p *parser) addField(styp *StructType, pos src.Pos, name *Name, typ Expr, tag *BasicLit) {
if tag != nil {
for i := len(styp.FieldList) - len(styp.TagList); i > 0; i-- {
styp.TagList = append(styp.TagList, nil)
@ -1202,15 +1198,11 @@ func (p *parser) addField(styp *StructType, name *Name, typ Expr, tag *BasicLit)
}
f := new(Field)
f.init(p)
f.pos = pos
f.Name = name
f.Type = typ
styp.FieldList = append(styp.FieldList, f)
if gcCompat && name != nil {
f.node = name.node
}
if debug && tag != nil && len(styp.FieldList) != len(styp.TagList) {
panic("inconsistent struct field list")
}
@ -1224,15 +1216,15 @@ func (p *parser) fieldDecl(styp *StructType) {
defer p.trace("fieldDecl")()
}
var name *Name
pos := p.pos()
switch p.tok {
case _Name:
name = p.name()
name := p.name()
if p.tok == _Dot || p.tok == _Literal || p.tok == _Semi || p.tok == _Rbrace {
// embed oliteral
typ := p.qualifiedName(name)
tag := p.oliteral()
p.addField(styp, nil, typ, tag)
p.addField(styp, pos, nil, typ, tag)
return
}
@ -1242,18 +1234,19 @@ func (p *parser) fieldDecl(styp *StructType) {
tag := p.oliteral()
for _, name := range names {
p.addField(styp, name, typ, tag)
p.addField(styp, name.Pos(), name, typ, tag)
}
case _Lparen:
p.next()
if p.tok == _Star {
// '(' '*' embed ')' oliteral
pos := p.pos()
p.next()
typ := indirect(p.qualifiedName(nil))
typ := indirect(pos, p.qualifiedName(nil))
p.want(_Rparen)
tag := p.oliteral()
p.addField(styp, nil, typ, tag)
p.addField(styp, pos, nil, typ, tag)
p.syntax_error("cannot parenthesize embedded type")
} else {
@ -1261,7 +1254,7 @@ func (p *parser) fieldDecl(styp *StructType) {
typ := p.qualifiedName(nil)
p.want(_Rparen)
tag := p.oliteral()
p.addField(styp, nil, typ, tag)
p.addField(styp, pos, nil, typ, tag)
p.syntax_error("cannot parenthesize embedded type")
}
@ -1269,17 +1262,17 @@ func (p *parser) fieldDecl(styp *StructType) {
p.next()
if p.got(_Lparen) {
// '*' '(' embed ')' oliteral
typ := indirect(p.qualifiedName(nil))
typ := indirect(pos, p.qualifiedName(nil))
p.want(_Rparen)
tag := p.oliteral()
p.addField(styp, nil, typ, tag)
p.addField(styp, pos, nil, typ, tag)
p.syntax_error("cannot parenthesize embedded type")
} else {
// '*' embed oliteral
typ := indirect(p.qualifiedName(nil))
typ := indirect(pos, p.qualifiedName(nil))
tag := p.oliteral()
p.addField(styp, nil, typ, tag)
p.addField(styp, pos, nil, typ, tag)
}
default:
@ -1291,7 +1284,7 @@ func (p *parser) fieldDecl(styp *StructType) {
func (p *parser) oliteral() *BasicLit {
if p.tok == _Literal {
b := new(BasicLit)
b.init(p)
b.pos = p.pos()
b.Value = p.lit
b.Kind = p.kind
p.next()
@ -1324,7 +1317,7 @@ func (p *parser) methodDecl() *Field {
}
f := new(Field)
f.init(p)
f.pos = name.Pos()
if p.tok != _Lparen {
// packname
f.Type = p.qualifiedName(name)
@ -1336,16 +1329,16 @@ func (p *parser) methodDecl() *Field {
return f
case _Lparen:
p.next()
p.syntax_error("cannot parenthesize embedded type")
f := new(Field)
f.init(p)
f.pos = p.pos()
p.next()
f.Type = p.qualifiedName(nil)
p.want(_Rparen)
p.syntax_error("cannot parenthesize embedded type")
return f
default:
p.syntax_error("")
p.syntax_error("expecting method or interface name")
p.advance(_Semi, _Rbrace)
return nil
}
@ -1358,7 +1351,7 @@ func (p *parser) paramDecl() *Field {
}
f := new(Field)
f.init(p)
f.pos = p.pos()
switch p.tok {
case _Name:
@ -1403,7 +1396,7 @@ func (p *parser) dotsType() *DotsType {
}
t := new(DotsType)
t.init(p)
t.pos = p.pos()
p.want(_DotDotDot)
t.Elem = p.tryType()
@ -1486,7 +1479,7 @@ func (p *parser) simpleStmt(lhs Expr, rangeOk bool) SimpleStmt {
defer p.trace("simpleStmt")()
}
if rangeOk && p.got(_Range) {
if rangeOk && p.tok == _Range {
// _Range expr
if debug && lhs != nil {
panic("invalid call of simpleStmt")
@ -1500,55 +1493,60 @@ func (p *parser) simpleStmt(lhs Expr, rangeOk bool) SimpleStmt {
if _, ok := lhs.(*ListExpr); !ok && p.tok != _Assign && p.tok != _Define {
// expr
pos := p.pos()
switch p.tok {
case _AssignOp:
// lhs op= rhs
op := p.op
p.next()
return p.newAssignStmt(op, lhs, p.expr())
return p.newAssignStmt(pos, op, lhs, p.expr())
case _IncOp:
// lhs++ or lhs--
op := p.op
p.next()
return p.newAssignStmt(op, lhs, ImplicitOne)
return p.newAssignStmt(pos, op, lhs, ImplicitOne)
case _Arrow:
// lhs <- rhs
p.next()
s := new(SendStmt)
s.init(p)
s.pos = pos
p.next()
s.Chan = lhs
s.Value = p.expr()
if gcCompat {
s.init(p)
}
return s
default:
// expr
return &ExprStmt{X: lhs}
s := new(ExprStmt)
if lhs != nil { // be cautious (test/syntax/semi4.go)
s.pos = lhs.Pos()
} else {
s.pos = p.pos()
}
s.X = lhs
return s
}
}
// expr_list
pos := p.pos()
switch p.tok {
case _Assign:
p.next()
if rangeOk && p.got(_Range) {
if rangeOk && p.tok == _Range {
// expr_list '=' _Range expr
return p.rangeClause(lhs, false)
}
// expr_list '=' expr_list
return p.newAssignStmt(0, lhs, p.exprList())
return p.newAssignStmt(pos, 0, lhs, p.exprList())
case _Define:
pos := p.pos()
p.next()
if rangeOk && p.got(_Range) {
if rangeOk && p.tok == _Range {
// expr_list ':=' range expr
return p.rangeClause(lhs, true)
}
@ -1566,10 +1564,13 @@ func (p *parser) simpleStmt(lhs Expr, rangeOk bool) SimpleStmt {
// TODO(mdempsky): Have Expr types implement Stringer?
p.error(fmt.Sprintf("invalid variable name %s in type switch", lhs))
}
return &ExprStmt{X: x}
s := new(ExprStmt)
s.pos = x.Pos()
s.X = x
return s
}
as := p.newAssignStmt(Def, lhs, rhs)
as := p.newAssignStmt(pos, Def, lhs, rhs)
as.pos = pos // TODO(gri) pass this into newAssignStmt
return as
@ -1582,19 +1583,17 @@ func (p *parser) simpleStmt(lhs Expr, rangeOk bool) SimpleStmt {
func (p *parser) rangeClause(lhs Expr, def bool) *RangeClause {
r := new(RangeClause)
r.init(p)
r.pos = p.pos()
p.next() // consume _Range
r.Lhs = lhs
r.Def = def
r.X = p.expr()
if gcCompat {
r.init(p)
}
return r
}
func (p *parser) newAssignStmt(op Operator, lhs, rhs Expr) *AssignStmt {
func (p *parser) newAssignStmt(pos src.Pos, op Operator, lhs, rhs Expr) *AssignStmt {
a := new(AssignStmt)
a.init(p)
a.pos = pos
a.Op = op
a.Lhs = lhs
a.Rhs = rhs
@ -1607,7 +1606,7 @@ func (p *parser) labeledStmt(label *Name) Stmt {
}
s := new(LabeledStmt)
s.init(p)
s.pos = p.pos()
s.Label = label
p.want(_Colon)
@ -1631,7 +1630,7 @@ func (p *parser) blockStmt() *BlockStmt {
}
s := new(BlockStmt)
s.init(p)
s.pos = p.pos()
p.want(_Lbrace)
s.Body = p.stmtList()
p.want(_Rbrace)
@ -1645,7 +1644,7 @@ func (p *parser) declStmt(f func(*Group) Decl) *DeclStmt {
}
s := new(DeclStmt)
s.init(p)
s.pos = p.pos()
p.next() // _Const, _Type, or _Var
s.DeclList = p.appendGroup(nil, f)
@ -1659,13 +1658,9 @@ func (p *parser) forStmt() Stmt {
}
s := new(ForStmt)
s.init(p)
s.pos = p.pos()
p.want(_For)
s.Init, s.Cond, s.Post = p.header(_For)
if gcCompat {
s.init(p)
}
s.Body = p.stmtBody("for clause")
return s
@ -1689,7 +1684,7 @@ func (p *parser) stmtBody(context string) []Stmt {
}
func (p *parser) header(keyword token) (init SimpleStmt, cond Expr, post SimpleStmt) {
// TODO(gri) move caller's p.want(keyword) here, once we removed gcCompat
p.want(keyword)
if p.tok == _Lbrace {
if keyword == _If {
@ -1765,15 +1760,9 @@ func (p *parser) ifStmt() *IfStmt {
}
s := new(IfStmt)
s.init(p)
s.pos = p.pos()
p.want(_If)
s.Init, s.Cond, _ = p.header(_If)
if gcCompat {
s.init(p)
}
s.Then = p.stmtBody("if clause")
if p.got(_Else) {
@ -1796,9 +1785,8 @@ func (p *parser) switchStmt() *SwitchStmt {
defer p.trace("switchStmt")()
}
p.want(_Switch)
s := new(SwitchStmt)
s.init(p)
s.pos = p.pos()
s.Init, s.Tag, _ = p.header(_Switch)
@ -1819,10 +1807,10 @@ func (p *parser) selectStmt() *SelectStmt {
defer p.trace("selectStmt")()
}
p.want(_Select)
s := new(SelectStmt)
s.init(p)
s.pos = p.pos()
p.want(_Select)
if !p.got(_Lbrace) {
p.syntax_error("missing { after select clause")
p.advance(_Case, _Default, _Rbrace)
@ -1841,7 +1829,7 @@ func (p *parser) caseClause() *CaseClause {
}
c := new(CaseClause)
c.init(p)
c.pos = p.pos()
switch p.tok {
case _Case:
@ -1868,7 +1856,7 @@ func (p *parser) commClause() *CommClause {
}
c := new(CommClause)
c.init(p)
c.pos = p.pos()
switch p.tok {
case _Case:
@ -1895,9 +1883,6 @@ func (p *parser) commClause() *CommClause {
p.advance(_Case, _Default, _Rbrace)
}
if gcCompat {
c.init(p)
}
p.want(_Colon)
c.Body = p.stmtList()
@ -1966,22 +1951,17 @@ func (p *parser) stmt() Stmt {
return p.ifStmt()
case _Fallthrough:
p.next()
s := new(BranchStmt)
s.init(p)
s.pos = p.pos()
p.next()
s.Tok = _Fallthrough
return s
// // will be converted to OFALL
// stmt := nod(OXFALL, nil, nil)
// stmt.Xoffset = int64(block)
// return stmt
case _Break, _Continue:
tok := p.tok
p.next()
s := new(BranchStmt)
s.init(p)
s.Tok = tok
s.pos = p.pos()
s.Tok = p.tok
p.next()
if p.tok == _Name {
s.Label = p.name()
}
@ -1991,31 +1971,25 @@ func (p *parser) stmt() Stmt {
return p.callStmt()
case _Goto:
p.next()
s := new(BranchStmt)
s.init(p)
s.pos = p.pos()
s.Tok = _Goto
p.next()
s.Label = p.name()
return s
// stmt := nod(OGOTO, p.new_name(p.name()), nil)
// stmt.Sym = dclstack // context, for goto restrictions
// return stmt
case _Return:
p.next()
s := new(ReturnStmt)
s.init(p)
s.pos = p.pos()
p.next()
if p.tok != _Semi && p.tok != _Rbrace {
s.Results = p.exprList()
}
if gcCompat {
s.init(p)
}
return s
case _Semi:
s := new(EmptyStmt)
s.init(p)
s.pos = p.pos()
return s
}
@ -2056,7 +2030,7 @@ func (p *parser) call(fun Expr) *CallExpr {
// call or conversion
// convtype '(' expr ocomma ')'
c := new(CallExpr)
c.init(p)
c.pos = p.pos()
c.Fun = fun
p.want(_Lparen)
@ -2071,9 +2045,6 @@ func (p *parser) call(fun Expr) *CallExpr {
}
p.xnest--
if gcCompat {
c.init(p)
}
p.want(_Rparen)
return c
@ -2086,7 +2057,7 @@ func (p *parser) name() *Name {
// no tracing to avoid overly verbose output
n := new(Name)
n.init(p)
n.pos = p.pos()
if p.tok == _Name {
n.Value = p.lit
@ -2132,7 +2103,7 @@ func (p *parser) qualifiedName(name *Name) Expr {
name = p.name()
default:
name = new(Name)
name.init(p)
name.pos = p.pos()
p.syntax_error("expecting name")
p.advance(_Dot, _Semi, _Rbrace)
}