}

func (u *unwinder) valid() bool {
	return u.frame.pc != 0
}

// resolveInternal fills in u.frame based on u.frame.fn, pc, and sp.
//
// innermost indicates that this is the first resolve on this stack. If
// innermost is set, isSyscall indicates that the PC/SP was retrieved from
// gp.syscall*; this is otherwise ignored.
//
// On entry, u.frame contains:
//   - fn is the running function.

		if m == nil {
			t.Errorf("%s: bad comment: %s", pos, text)
			return
		}
		name, want := m[1], m[2]

		// Look up the name in the innermost enclosing scope.
		inner := mainScope.Innermost(pos)
		if inner == nil {
			t.Errorf("%s: at %s: can't find innermost scope", pos, text)
			return
		}
		got := "undef"
		if _, obj := inner.LookupParent(name, pos); obj != nil {

	// Go spec: The scope of a constant or variable identifier declared inside
	// a function begins at the end of the ConstSpec or VarSpec and ends at
	// the end of the innermost containing block.
	// (Global identifiers are resolved in a separate phase after parsing.)
	spec := &ast.ValueSpec{doc, idents, typ, values, p.lineComment}
	p.declare(spec, p.topScope, ast.Con, idents...)

					fset.Position(comment.Pos()), comment.Text)
				continue
			}
			name, want := m[1], m[2]

			// Look up the name in the innermost enclosing scope.
			inner := mainScope.Innermost(comment.Pos())
			if inner == nil {
				t.Errorf("%s: at %s: can't find innermost scope",
					fset.Position(comment.Pos()), comment.Text)
				continue
			}
			got := "undef"

		check.overflow(x, e.Pos())

	case *ast.FuncLit:
		if sig, ok := check.typ(e.Type).(*Signature); ok {
			// Set the Scope's extent to the complete "func (...) {...}"
			// so that Scope.Innermost works correctly.
			sig.scope.pos = e.Pos()
			sig.scope.end = e.End()
			if !check.conf.IgnoreFuncBodies && e.Body != nil {
				// Anonymous functions are considered part of the

	//
	// For client requests, a value of 0 with a non-nil Body is
	// also treated as unknown.
	ContentLength int64

	// TransferEncoding lists the transfer encodings from outermost to
	// innermost. An empty list denotes the "identity" encoding.
	// TransferEncoding can usually be ignored; chunked encoding is
	// automatically added and removed as necessary when sending and
	// receiving requests.

	return after, nil
}

// repeatIsValid reports whether the repetition re is valid.
// Valid means that the combination of the top-level repetition
// and any inner repetitions does not exceed n copies of the
// innermost thing.
// This function rewalks the regexp tree and is called for every repetition,
// so we have to worry about inducing quadratic behavior in the parser.
// We avoid this by only calling repeatIsValid when min or max >= 2.

		check.overflow(x, opPos(x.expr))

	case *syntax.FuncLit:
		if sig, ok := check.typ(e.Type).(*Signature); ok {
			// Set the Scope's extent to the complete "func (...) {...}"
			// so that Scope.Innermost works correctly.
			sig.scope.pos = e.Pos()
			sig.scope.end = syntax.EndPos(e)
			if !check.conf.IgnoreFuncBodies && e.Body != nil {
				// Anonymous functions are considered part of the