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Add jep513 module: flexible constructor bodies on JDK 25 and 27

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Runnable sources, broken examples and captured transcripts for the ankurm.com JEP 513 article, including the JDK 25 vs 27 compiler wording differences.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
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Claude
2026-09-24 10:42:36 +00:00
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jep513/README.md
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# jep513 — Flexible Constructor Bodies (JEP 513, final in Java 25)
Companion code for the ankurm.com article **Flexible Constructor Bodies in Java 25 (JEP 513): Validate Before super()**. The explanation
lives in the article; this folder holds the runnable sources and the transcripts they produced.
```bash
JDK25=/path/to/jdk-25 JDK27=/path/to/jdk-27 [JDK21=/path/to/jdk-21] ./run.sh # regenerates output/*.txt
```
`src/` runs; `broken/` fails to compile on purpose (the messages are captured in `output/03`, `07` and `08`). Tested on Temurin 25.0.4.1+1 and 27+35;
JDK 21 is used only to show the "before" error.