1. Reported error about JEP 432's enhanced for loop, when deconstructing a record with primitive components.

public class RecordPatternTest {
    public static void main(String argv[]) {
        Point[] pointArray = {new Point(1,2), new Point(3,4)};
        dump(pointArray);
    }

    record Point(int x, int y) {}

    static void dump(Point[] pointArray) {
        for (Point(int x, int y) : pointArray) {
            System.out.println("(" + x + ", " + y + ")");
        }
    }
}

$ java --enable-preview --source 20 RecordPatternTest.java

RecordPatternTest.java:10: error: '.class' expected

        for (Point(int x, int y) : pointArray) {
                       ^
RecordPatternTest.java:10: error: ';' expected
        for (Point(int x, int y) : pointArray) {
                        ^
RecordPatternTest.java:10: error: '.class' expected
        for (Point(int x, int y) : pointArray) {
                              ^
RecordPatternTest.java:10: error: not a statement
        for (Point(int x, int y) : pointArray) {
                          ^
RecordPatternTest.java:10: error: ';' expected

        for (Point(int x, int y) : pointArray) {
                               ^
RecordPatternTest.java:10: error: not a statement
        for (Point(int x, int y) : pointArray) {
                                   ^
RecordPatternTest.java:10: error: ';' expected
        for (Point(int x, int y) : pointArray) {
                                             ^
7 errors
error: compilation failed
 
However, if we use “var” instead of “int”, i.e.
for (Point(var x, var y) : pointArray) {
then it works:
 
$ java --enable-preview --source 20 RecordPatternTest.java
Note: RecordPatternTest.java uses preview features of Java SE 20.
Note: Recompile with -Xlint:preview for details.
(1, 2)
(3, 4)

2. Nested patterns raise parsing error
3. Lambdas in normal for erroneously parsed as patterns:

static <T> void method2(Function<Integer, Integer> f) {}
int i = 42;
for (method2((Integer a) -> 42); i == 0;) { i++; }