patterns: run Guards, NullCase and MatchException demos on 21 too; add switch-on-long check

Adds broken/SwitchOnLong.java and regenerates transcripts so every 'runs on 21, 25 and 27' claim has a transcript. Additive commit.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a

patterns/broken/SwitchOnLong.java

@@ -0,0 +1,10 @@
+public class SwitchOnLong {
+    public static void main(String[] args) {
+        long n = 1L;
+        String s = switch (n) {          // switch on long: not allowed without the preview
+            case 0L -> "zero";
+            default -> "other";
+        };
+        System.out.println(s);
+    }
+}

patterns/output/02-guards-and-dominance.txt

@@ -1,3 +1,11 @@
+$ javac src/Guards.java && java Guards     (21.0.10+7-Ubuntu-124.04)
+empty string
+short string: abc
+long string: abcdefgh
+negative -4
+int 12
+other
+
 $ javac src/Guards.java && java Guards     (25.0.4.1+1-LTS)
 empty string
 short string: abc

patterns/output/03-record-patterns.txt

@@ -22,6 +22,10 @@ box of string hi
 box of int 7
 box of 2.5
 
+$ javac src/MatchExceptionDemo.java && java MatchExceptionDemo     (21.0.10+7-Ubuntu-124.04)
+MatchException: java.lang.IllegalStateException: accessor blew up
+cause: java.lang.IllegalStateException: accessor blew up
+
 $ javac src/MatchExceptionDemo.java && java MatchExceptionDemo     (25.0.4.1+1-LTS)
 MatchException: java.lang.IllegalStateException: accessor blew up
 cause: java.lang.IllegalStateException: accessor blew up

patterns/output/06-null-and-unnamed.txt

@@ -1,3 +1,9 @@
+$ javac src/NullCase.java && java NullCase     (21.0.10+7-Ubuntu-124.04)
+without case null: NullPointerException
+with case null: null!
+case null, default: null or something else
+instanceof with null: false
+
 $ javac src/NullCase.java && java NullCase     (25.0.4.1+1-LTS)
 without case null: NullPointerException
 with case null: null!

patterns/output/07-primitive-patterns.txt

@@ -12,6 +12,26 @@ preview/PrimitiveInstanceof.java:3: error: primitive patterns are a preview feat
   (use --enable-preview to enable primitive patterns)
 1 error
 
+$ javac broken/SwitchOnLong.java     (21.0.10+7-Ubuntu-124.04)
+broken/SwitchOnLong.java:4: error: selector type long is not allowed
+        String s = switch (n) {          // switch on long: not allowed without the preview
+                          ^
+1 error
+
+$ javac broken/SwitchOnLong.java     (25.0.4.1+1-LTS)
+broken/SwitchOnLong.java:4: error: primitive patterns are a preview feature and are disabled by default.
+        String s = switch (n) {          // switch on long: not allowed without the preview
+                          ^
+  (use --enable-preview to enable primitive patterns)
+1 error
+
+$ javac broken/SwitchOnLong.java     (27+35)
+broken/SwitchOnLong.java:4: error: primitive patterns are a preview feature and are disabled by default.
+        String s = switch (n) {          // switch on long: not allowed without the preview
+                          ^
+  (use --enable-preview to enable primitive patterns)
+1 error
+
 $ javac --enable-preview --release 25 preview/PrimitiveInstanceof.java && java --enable-preview PrimitiveInstanceof     (25.0.4.1+1-LTS)
 100 fits in a byte: 100
 1000 fits in a short: 1000

patterns/run.sh

@@ -31,10 +31,10 @@ all3() { local fn="$1"; shift; [ -n "$JDK21" ] && { "$fn" "$JDK21" "$@"; echo; }
 { all3 cr src/TypePatterns.java TypePatterns; } > "$OUT/01-type-patterns.txt"
 
 # 02 - guards and dominance
-{ both cr src/Guards.java Guards; echo; both co broken/Dominated.java; echo; both co broken/GuardBeforeGeneral.java; } > "$OUT/02-guards-and-dominance.txt"
+{ all3 cr src/Guards.java Guards; echo; both co broken/Dominated.java; echo; both co broken/GuardBeforeGeneral.java; } > "$OUT/02-guards-and-dominance.txt"
 
 # 03 - record patterns, and what happens when an accessor throws
-{ all3 cr src/RecordPatterns.java RecordPatterns; echo; both cr src/MatchExceptionDemo.java MatchExceptionDemo; } > "$OUT/03-record-patterns.txt"
+{ all3 cr src/RecordPatterns.java RecordPatterns; echo; all3 cr src/MatchExceptionDemo.java MatchExceptionDemo; } > "$OUT/03-record-patterns.txt"
 
 # 04 - exhaustiveness: the compiler's check, and what separate compilation can still break
 { all3 cr src/SealedExhaustive.java SealedExhaustive; echo
@@ -51,10 +51,11 @@ all3() { local fn="$1"; shift; [ -n "$JDK21" ] && { "$fn" "$JDK21" "$@"; echo; }
   done; } > "$OUT/05-separate-compilation.txt"
 
 # 06 - null and unnamed patterns
-{ both cr src/NullCase.java NullCase; echo; all3 cr src/Unnamed.java Unnamed; } > "$OUT/06-null-and-unnamed.txt"
+{ all3 cr src/NullCase.java NullCase; echo; all3 cr src/Unnamed.java Unnamed; } > "$OUT/06-null-and-unnamed.txt"
 
 # 07 - primitive patterns (preview)
 { for f in PrimitiveInstanceof; do both co preview/$f.java; done; echo
+  all3 co broken/SwitchOnLong.java; echo
   for f in PrimitiveInstanceof PrimitiveSwitch PrimitiveInRecord PrimitiveEdges; do both crp preview/$f.java $f; echo; done
   both crp preview/BoxedToNarrower.java BoxedToNarrower; } > "$OUT/07-primitive-patterns.txt"
 { o="$(mk)"; "$JDK25/bin/javac" --enable-preview --release 25 -d "$o" preview/PrimitiveSwitch.java 2>&1 | grep -v '^Note:'