PREFIX_EXPRESSION -> tree.unsupported(node, UnsupportedLanguageFeature.PrefixExpression)
            OPERATION_REFERENCE -> tree.unsupported(node, UnsupportedLanguageFeature.UnsupportedOperator)
            PARENTHESIZED -> parenthesized(tree, node)
            LAMBDA_EXPRESSION -> tree.unsupported(node, UnsupportedLanguageFeature.FunctionDeclaration)
            THIS_EXPRESSION -> Element(This(tree.sourceData(node)))

import org.jetbrains.kotlin.KtNodeTypes.FUNCTION_LITERAL
import org.jetbrains.kotlin.KtNodeTypes.LAMBDA_ARGUMENT
import org.jetbrains.kotlin.KtNodeTypes.LAMBDA_EXPRESSION
import org.jetbrains.kotlin.KtNodeTypes.PARENTHESIZED
import org.jetbrains.kotlin.KtNodeTypes.SCRIPT
import org.jetbrains.kotlin.com.intellij.lang.LighterASTNode
import org.jetbrains.kotlin.com.intellij.lang.impl.PsiBuilderImpl

// component. If the second N is unsigned, a + sign is required between the two components
// as indicated by the ±. If the second N is NaN, only a + sign is accepted.
// The form may be parenthesized and cannot contain any spaces.
// The resulting complex number consists of the two components converted by ParseFloat.
//
// The errors that ParseComplex returns have concrete type [*NumError]
// and include err.Num = s.

	{"field on interface", "{{.foo}}", "<no value>", nil, true},
	{"field on parenthesized interface", "{{(.).foo}}", "<no value>", nil, true},

	// Issue 31810: Parenthesized first element of pipeline with arguments.
	// See also TestIssue31810.
	{"unparenthesized non-function", "{{1 2}}", "", nil, false},
	{"parenthesized non-function", "{{(1) 2}}", "", nil, false},
	{"parenthesized non-function with no args", "{{(1)}}", "1", nil, true}, // This is fine.

// be incomplete.
type Info struct {
	// Types maps expressions to their types, and for constant
	// expressions, also their values. Invalid expressions are
	// omitted.
	//
	// For (possibly parenthesized) identifiers denoting built-in
	// functions, the recorded signatures are call-site specific:
	// if the call result is not a constant, the recorded type is
	// an argument-specific signature. Otherwise, the recorded type

// be incomplete.
type Info struct {
	// Types maps expressions to their types, and for constant
	// expressions, also their values. Invalid expressions are
	// omitted.
	//
	// For (possibly parenthesized) identifiers denoting built-in
	// functions, the recorded signatures are call-site specific:
	// if the call result is not a constant, the recorded type is
	// an argument-specific signature. Otherwise, the recorded type

	go ( /* ERROR "expression in go must not be parenthesized" */ gos())
	go gos()
	var c chan int
	go close(c)
	go len /* ERROR "go discards result" */ (c)
}

func defers() {
	defer 1; /* ERROR "must be function call" */
	defer int /* ERROR "defer requires function call, not conversion" */ (0)
	defer ( /* ERROR "expression in defer must not be parenthesized" */ defers())
	defer defers()
	var c chan int

	}
	if m := check.Types; m != nil {
		m[x] = TypeAndValue{mode, typ, val}
	}
}

func (check *Checker) recordBuiltinType(f ast.Expr, sig *Signature) {
	// f must be a (possibly parenthesized, possibly qualified)
	// identifier denoting a built-in (including unsafe's non-constant
	// functions Add and Slice): record the signature for f and possible
	// children.
	for {

			stv.SetAssignable()
		}
		if tv.HasOk() {
			stv.SetHasOk()
		}
		x.SetTypeInfo(stv)
	}
}

func (check *Checker) recordBuiltinType(f syntax.Expr, sig *Signature) {
	// f must be a (possibly parenthesized, possibly qualified)
	// identifier denoting a built-in (including unsafe's non-constant
	// functions Add and Slice): record the signature for f and possible
	// children.
	for {

}

// An LParen represents the beginning of a parenthesized line block.
// It is a place to store suffix comments.
type LParen struct {
	Comments
	Pos Position
}

func (x *LParen) Span() (start, end Position) {
	return x.Pos, x.Pos.add(")")
}

// An RParen represents the end of a parenthesized line block.
// It is a place to store whole-line (before) comments.