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feat(codegen): enforce generated runtime compatibility - #274

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tinovyatkin merged 6 commits into
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issue-273-codegen-api
Aug 1, 2026
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feat(codegen): enforce generated runtime compatibility#274
tinovyatkin merged 6 commits into
mainfrom
issue-273-codegen-api

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@tinovyatkin

@tinovyatkin tinovyatkin commented Aug 1, 2026

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Summary

  • define a generated-code API revision shared by antlr4-rust-gen and the runtime
  • emit a compile-time compatibility check in every generated lexer and parser module
  • report generator provenance, requested/supported revisions, and remediation for mismatches
  • cover compatible multi-module and mixed-revision crates with real cargo check tests
  • migrate checked-in recognizers and document consumer and maintainer policy

Implementation notes

The check is emitted before the broad generated-module allow attributes, so a mismatch remains a hard compile error. Package SemVer remains provenance and matching releases remain recommended, while the integer API revision is the actual source compatibility contract.

Runtimes that implement the check provide the targeted mismatch diagnostic. A runtime predating the macro fails safely with a missing-macro error; the migration docs call out upgrading that runtime or regenerating with its matching older generator.

The self-hosted ANTLR frontend was regenerated through its Stage 0 -> Stage 1 -> Stage 2 fixed-point flow. The XPath regeneration differed only in its version banner and compatibility check.

Validation

  • tools/grammar-frontend/update-stage0.sh --update
  • cargo test --locked
  • cargo test --locked --all-features --workspace
  • cargo clippy --locked --all-targets --all-features -- -D warnings
  • cargo fmt --check

Closes #273

Summary by CodeRabbit

  • New Features

    • Added generated-code and runtime compatibility checks with clear compile-time diagnostics.
    • Generated sources now record package and API compatibility metadata.
  • Documentation

    • Documented compatibility requirements, revision policies, and regeneration guidance.
  • Tests

    • Added end-to-end coverage for compatible and incompatible generated-code revisions.
    • Improved validation and snapshot stability for generated output.

Define a generated-code API revision shared by the generator and runtime, and emit a compile-time check into every generated module. Unsupported revisions now report the generator version, requested and supported revisions, and both remediation paths before incidental Rust API errors obscure the cause.

Cover compatible lexer/parser pairs and mixed-revision failures, migrate the checked-in recognizers, and document the consumer migration and maintainer bump policy.
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Reviewing files that changed from the base of the PR and between d95d71e and 2124326.

📒 Files selected for processing (1)
  • tests/antlr4_rust_gen_cli.rs
📝 Walkthrough

Walkthrough

The runtime now exposes a generated-code API revision check. The generator emits this check in lexer and parser modules. Documentation defines compatibility rules, and tests cover successful compilation and unsupported revisions.

Changes

Generated-code compatibility

Layer / File(s) Summary
Runtime contract and compatibility policy
src/lib.rs, AGENTS.md, CLAUDE.md, README.md
Defines the supported API revision, compile-time diagnostic macro, revision policy, and migration guidance.
Generated module compatibility headers
src/bin/antlr4-rust-gen.rs
Generates dynamic headers with package metadata and the runtime API check for lexers and parsers. Rendering tests validate the headers.
End-to-end validation and generated source updates
tests/antlr4_rust_gen_cli.rs, third_party/antlr-v4-grammar/self-hosted.sha256
Tests successful and failed compatibility checks with normalized diagnostics. Updates checked-in recognizer checksums.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Generator
  participant GeneratedModule
  participant Runtime
  participant Cargo
  Generator->>GeneratedModule: Emit API revision and generator version
  GeneratedModule->>Runtime: Invoke compatibility macro
  Runtime-->>Cargo: Accept revision or emit compile-time error
  Cargo-->>GeneratedModule: Report compilation result
Loading

Possibly related PRs

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name Status Explanation Resolution
Linked Issues check ❓ Inconclusive Most requirements are evidenced, but docs/migration.md and required snapshot files were excluded, so their exact compliance cannot be verified. Review docs/migration.md and the excluded snapshots to confirm migration guidance and stable compatibility diagnostics.
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly summarizes the main change: compile-time compatibility enforcement for generated code and the runtime.
Out of Scope Changes check ✅ Passed The changes support the linked issue, including implementation, tests, documentation, recognizer migration, and frontend regeneration.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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📝 Generate docstrings
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  • Commit on current branch
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch issue-273-codegen-api

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@claude

claude Bot commented Aug 1, 2026

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Code Review — PR #274

  • Gather PR diff and context
  • Review the runtime handshake macro (src/lib.rs)
  • Review generator emission (src/bin/antlr4-rust-gen.rs)
  • Review tests + snapshots
  • Review docs (README/AGENTS/CLAUDE/migration) and regenerated artifacts
  • Verify findings by building/testing
  • Post consolidated review

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/bin/antlr4-rust-gen.rs`:
- Around line 15825-15836: Update the test containing generated_module_header()
to add a named external insta::assert_snapshot! for the header, normalizing
env!("CARGO_PKG_VERSION") to <generator-version> before snapshotting. Preserve
the existing generated-header assertions and derived-order checks, and annotate
this test with #[allow(clippy::disallowed_methods)].
🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

ℹ️ Review info
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Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 3608ac45-a7ba-4375-b674-7735697b49d2

📥 Commits

Reviewing files that changed from the base of the PR and between 20b5f7e and b469d03.

⛔ Files ignored due to path filters (6)
  • docs/migration.md is excluded by !**/docs/**
  • src/bin_support/grammar/generated/antlr_v4_lexer.rs is excluded by !**/generated/**
  • src/bin_support/grammar/generated/antlr_v4_parser.rs is excluded by !**/generated/**
  • src/xpath/generated/x_path_lexer.rs is excluded by !**/generated/**
  • tests/snapshots/antlr4_rust_gen_cli__generated_codegen_api_checks.snap is excluded by !**/*.snap
  • tests/snapshots/antlr4_rust_gen_cli__generated_codegen_api_mismatch_diagnostic.snap is excluded by !**/*.snap
📒 Files selected for processing (7)
  • AGENTS.md
  • CLAUDE.md
  • README.md
  • src/bin/antlr4-rust-gen.rs
  • src/lib.rs
  • tests/antlr4_rust_gen_cli.rs
  • third_party/antlr-v4-grammar/self-hosted.sha256

Comment thread src/bin/antlr4-rust-gen.rs
Pin the complete file-level header while normalizing only the package version, preserving the existing structural assertions for derived ordering properties.
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Codecov Report

✅ All modified and coverable lines are covered by tests.

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💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 5fb701dd8e

ℹ️ About Codex in GitHub

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Comment thread README.md Outdated
Qualify the targeted compatibility diagnostic for runtimes that implement the handshake, and document the safe missing-macro failure and remediation for older runtimes.
@tinovyatkin

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Codex Review: Didn't find any major issues. More of your lovely PRs please.

Reviewed commit: 68783c849b

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Disable Cargo color in nested generated-project checks and snapshot only the first compiler diagnostic block. This keeps coverage wrappers and CI terminal settings from changing the compatibility contract snapshot.
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📊 Source Code Metrics (this PR vs main)

File Cyclomatic Cognitive Functions LLOC MI
src/bin/antlr4-rust-gen.rs 2755 (main: 2754) 🔴 1760 ⚪ 587 (main: 586) 🔴 4827 (main: 4824) 🔴 0 ⚪
src/lib.rs 4 ⚪ 3 ⚪ 1 ⚪ 7 ⚪ 30.19 (main: 32.47) 🔴

Generated by mehen v1.7.0 — the code quality watcher.

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Copy/Paste Detection

Found 1833 duplication(s) across 6 changed Rust file(s) (threshold: 100 tokens).

Show duplications

Found a 5 line (823 tokens) duplication in the following files:

  • Starting at line 103 of src/bin_support/grammar/generated/antlr_v4_lexer.rs
  • Starting at line 167 of src/bin_support/grammar/generated/antlr_v4_parser.rs
    &["DOC_COMMENT", "BLOCK_COMMENT", "LINE_COMMENT", "INT", "STRING_LITERAL", "UNTERMINATED_STRING_LITERAL", "BEGIN_ARGUMENT", "ACTION", "NESTED_ACTION", "OPTIONS", "TOKENS", "CHANNELS", "IMPORT", "FRAGMENT", "LEXER", "PARSER", "GRAMMAR", "PROTECTED", "PUBLIC", "PRIVATE", "RETURNS", "LOCALS", "THROWS", "CATCH", "FINALLY", "MODE", "COLON", "COLONCOLON", "COMMA", "SEMI", "LPAREN", "RPAREN", "RBRACE", "RARROW", "LT", "GT", "ASSIGN", "QUESTION", "STAR", "PLUS_ASSIGN", "PLUS", "OR", "DOLLAR", "RANGE", "DOT", "AT", "POUND", "NOT", "ID", "WS", "NESTED_ARGUMENT", "ARGUMENT_ESCAPE", "ARGUMENT_STRING_LITERAL", "ARGUMENT_CHAR_LITERAL", "END_ARGUMENT", "UNTERMINATED_ARGUMENT", "ARGUMENT_CONTENT", "LEXER_CHAR_SET_BODY", "LEXER_CHAR_SET", "UNTERMINATED_CHAR_SET", "ESC_SEQUENCE", "HexDigit", "UnicodeESC", "DoubleQuoteLiteral", "TripleQuoteLiteral", "BacktickQuoteLiteral", "NameChar", "NameStartChar"],
    &[None, None, None, None, None, None, None, Some("\'=\'"), None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, Some("\'[\'"), None, None, None, Some("\'import\'"), Some("\'fragment\'"), Some("\'lexer\'"), Some("\'parser\'"), Some("\'grammar\'"), Some("\'protected\'"), Some("\'public\'"), Some("\'private\'"), Some("\'returns\'"), Some("\'locals\'"), Some("\'throws\'"), Some("\'catch\'"), Some("\'finally\'"), Some("\'mode\'"), Some("\':\'"), Some("\'::\'"), Some("\',\'"), Some("\';\'"), Some("\'(\'"), Some("\')\'"), Some("\'}\'"), Some("\'->\'"), Some("\'<\'"), Some("\'>\'"), Some("\'?\'"), Some("\'*\'"), Some("\'+=\'"), Some("\'+\'"), Some("\'|\'"), Some("\'$\'"), Some("\'..\'"), Some("\'.\'"), Some("\'@\'"), Some("\'#\'"), Some("\'~\'"), None, None, None, None, None],
    &[None, None, None, None, Some("ACTION"), Some("ARG_ACTION"), Some("ARG_OR_CHARSET"), Some("ASSIGN"), Some("LEXER_CHAR_SET"), Some("RULE_REF"), Some("SEMPRED"), Some("STRING_LITERAL"), Some("TOKEN_REF"), Some("UNICODE_ESC"), Some("UNICODE_EXTENDED_ESC"), Some("WS"), Some("ALT"), Some("BLOCK"), Some("CLOSURE"), Some("ELEMENT_OPTIONS"), Some("EPSILON"), Some("LEXER_ACTION_CALL"), Some("LEXER_ALT_ACTION"), Some("OPTIONAL"), Some("POSITIVE_CLOSURE"), Some("RULE"), Some("RULEMODIFIERS"), Some("RULES"), Some("SET"), Some("WILDCARD"), Some("DOC_COMMENT"), Some("BLOCK_COMMENT"), Some("LINE_COMMENT"), Some("INT"), Some("UNTERMINATED_STRING_LITERAL"), Some("BEGIN_ARGUMENT"), Some("OPTIONS"), Some("TOKENS"), Some("CHANNELS"), Some("IMPORT"), Some("FRAGMENT"), Some("LEXER"), Some("PARSER"), Some("GRAMMAR"), Some("PROTECTED"), Some("PUBLIC"), Some("PRIVATE"), Some("RETURNS"), Some("LOCALS"), Some("THROWS"), Some("CATCH"), Some("FINALLY"), Some("MODE"), Some("COLON"), Some("COLONCOLON"), Some("COMMA"), Some("SEMI"), Some("LPAREN"), Some("RPAREN"), Some("RBRACE"), Some("RARROW"), Some("LT"), Some("GT"), Some("QUESTION"), Some("STAR"), Some("PLUS_ASSIGN"), Some("PLUS"), Some("OR"), Some("DOLLAR"), Some("RANGE"), Some("DOT"), Some("AT"), Some("POUND"), Some("NOT"), Some("ID"), Some("END_ARGUMENT"), Some("UNTERMINATED_ARGUMENT"), Some("ARGUMENT_CONTENT"), Some("UNTERMINATED_CHAR_SET")],
    &[None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None, None],
    &["DEFAULT_TOKEN_CHANNEL", "HIDDEN", "OFF_CHANNEL", "COMMENT"],
```rust

---

Found a 80 line (613 tokens) duplication in the following files:
* Starting at line 14 of src/bin_support/grammar/generated/antlr_v4_lexer.rs
* Starting at line 17 of src/bin_support/grammar/generated/antlr_v4_parser.rs

```rust
use std::sync::OnceLock;

pub const EOF: i32 = antlr4_runtime::TOKEN_EOF;
pub const ACTION: i32 = 4;
pub const ARG_ACTION: i32 = 5;
pub const ARG_OR_CHARSET: i32 = 6;
pub const ASSIGN: i32 = 7;
pub const LEXER_CHAR_SET: i32 = 8;
pub const RULE_REF: i32 = 9;
pub const SEMPRED: i32 = 10;
pub const STRING_LITERAL: i32 = 11;
pub const TOKEN_REF: i32 = 12;
pub const UNICODE_ESC: i32 = 13;
pub const UNICODE_EXTENDED_ESC: i32 = 14;
pub const WS: i32 = 15;
pub const ALT: i32 = 16;
pub const BLOCK: i32 = 17;
pub const CLOSURE: i32 = 18;
pub const ELEMENT_OPTIONS: i32 = 19;
pub const EPSILON: i32 = 20;
pub const LEXER_ACTION_CALL: i32 = 21;
pub const LEXER_ALT_ACTION: i32 = 22;
pub const OPTIONAL: i32 = 23;
pub const POSITIVE_CLOSURE: i32 = 24;
pub const RULE: i32 = 25;
pub const RULEMODIFIERS: i32 = 26;
pub const RULES: i32 = 27;
pub const SET: i32 = 28;
pub const WILDCARD: i32 = 29;
pub const DOC_COMMENT: i32 = 30;
pub const BLOCK_COMMENT: i32 = 31;
pub const LINE_COMMENT: i32 = 32;
pub const INT: i32 = 33;
pub const UNTERMINATED_STRING_LITERAL: i32 = 34;
pub const BEGIN_ARGUMENT: i32 = 35;
pub const OPTIONS: i32 = 36;
pub const TOKENS: i32 = 37;
pub const CHANNELS: i32 = 38;
pub const IMPORT: i32 = 39;
pub const FRAGMENT: i32 = 40;
pub const LEXER: i32 = 41;
pub const PARSER: i32 = 42;
pub const GRAMMAR: i32 = 43;
pub const PROTECTED: i32 = 44;
pub const PUBLIC: i32 = 45;
pub const PRIVATE: i32 = 46;
pub const RETURNS: i32 = 47;
pub const LOCALS: i32 = 48;
pub const THROWS: i32 = 49;
pub const CATCH: i32 = 50;
pub const FINALLY: i32 = 51;
pub const MODE: i32 = 52;
pub const COLON: i32 = 53;
pub const COLONCOLON: i32 = 54;
pub const COMMA: i32 = 55;
pub const SEMI: i32 = 56;
pub const LPAREN: i32 = 57;
pub const RPAREN: i32 = 58;
pub const RBRACE: i32 = 59;
pub const RARROW: i32 = 60;
pub const LT: i32 = 61;
pub const GT: i32 = 62;
pub const QUESTION: i32 = 63;
pub const STAR: i32 = 64;
pub const PLUS_ASSIGN: i32 = 65;
pub const PLUS: i32 = 66;
pub const OR: i32 = 67;
pub const DOLLAR: i32 = 68;
pub const RANGE: i32 = 69;
pub const DOT: i32 = 70;
pub const AT: i32 = 71;
pub const POUND: i32 = 72;
pub const NOT: i32 = 73;
pub const ID: i32 = 74;
pub const END_ARGUMENT: i32 = 75;
pub const UNTERMINATED_ARGUMENT: i32 = 76;
pub const ARGUMENT_CONTENT: i32 = 77;
pub const UNTERMINATED_CHAR_SET: i32 = 78;

pub const CHANNEL_COMMENT: i32 = 3;

Found a 1 line (391 tokens) duplication in the following files:

  • Starting at line 220 of src/bin_support/grammar/generated/antlr_v4_lexer.rs
  • Starting at line 220 of src/bin_support/grammar/generated/antlr_v4_lexer.rs
static LEXER_DFA_DATA: &[u32] = &[1280852999,3,0,4096,4133,4138,0,0,65535,4294967295,1,1,65535,0,2,2,65535,1,2,2,65535,2,3,3,65535,3,2,2,65535,4,2,2,65535,5,2,2,65535,6,4,2,65535,7,2,2,65535,8,5,2,65535,4294967295,6,2,65535,9,7,2,65535,4294967295,2,2,65535,10,8,2,65535,11,9,2,65535,12,2,2,65535,13,2,2,65535,14,2,2,65535,15,2,2,65535,16,2,2,65535,17,2,2,65535,18,10,4,65535,19,2,2,65535,20,11,4,65535,21,12,4,65535,22,13,4,65535,23,14,4,65535,24,15,4,65535,25,16,4,65535,26,17,4,65535,27,18,4,65535,28,19,4,65535,29,20,4,65535,30,21,5,65535,4294967295,2,2,65535,31,2,2,65535,32,2,2,65535,33,2,2,65535,34,22,3,68,4294967295,2,2,65535,35,2,2,65535,36,2,2,65535,37,23,6,70,4294967295,24,7,65535,38,2,2,65535,39,25,4,65535,40,26,4,65535,41,27,4,65535,42,28,4,65535,43,29,4,65535,44,30,4,65535,45,31,4,65535,46,32,4,65535,47,33,4,65535,48,34,4,65535,49,35,4,65535,50,36,4,65535,51,37,4,65535,52,38,4,65535,53,39,4,65535,54,40,4,65535,55,41,8,65535,4294967295,42,9,65535,4294967295,43,5,65535,4294967295,44,5,65535,4294967295,45,10,65535,4294967295,2,2,65535,56,46,11,65535,57,47,3,65535,58,2,2,65535,59,48,6,70,4294967295,49,12,102,4294967295,50,4,65535,60,51,4,65535,61,52,4,65535,62,53,4,65535,63,54,4,65535,64,55,4,65535,65,56,4,65535,66,57,4,65535,67,58,4,65535,68,59,4,65535,69,60,4,65535,70,61,4,65535,71,62,4,65535,72,63,4,65535,73,64,4,65535,74,65,4,65535,75,66,4,65535,76,67,8,65535,4294967295,68,5,65535,4294967295,69,8,124,4294967295,70,9,126,4294967295,71,13,65535,4294967295,72,14,65535,4294967295,73,10,142,4294967295,74,15,65535,4294967295,2,2,65535,77,75,11,68,4294967295,76,3,65535,78,77,6,70,4294967295,2,2,65535,79,78,12,102,4294967295,79,12,102,4294967295,80,16,152,80,81,4,65535,81,82,4,65535,82,83,4,65535,83,84,4,65535,84,85,4,65535,85,86,4,65535,86,87,4,65535,87,88,4,65535,88,10,4,65535,89,89,4,65535,90,90,4,65535,91,91,4,65535,92,92,4,65535,93,93,4,65535,94,94,4,65535,95,95,4,65535,96,96,4,65535,97,97,17,65535,4294967295,98,18,65535,4294967295,99,8,65535,4294967295,100,19,65535,4294967295,101,9,65535,4294967295,102,20,65535,4294967295,103,21,65535,4294967295,104,13,65535,4294967295,105,13,65535,4294967295,106,13,65535,4294967295,107,22,65535,4294967295,108,23,65535,98,109,14,65535,4294967295,110,24,65535,4294967295,111,25,65535,4294967295,112,26,65535,4294967295,109,14,65535,4294967295,113,27,65535,4294967295,109,14,65535,99,114,28,65535,4294967295,115,10,65535,4294967295,116,29,65535,4294967295,117,15,65535,4294967295,118,15,142,4294967295,119,30,65535,4294967295,120,11,65535,100,121,3,65535,101,2,2,65535,102,2,2,65535,103,2,2,65535,104,80,16,152,4294967295,122,16,152,4294967295,10,4,65535,105,123,4,65535,106,124,4,65535,107,125,4,65535,108,126,4,65535,109,127,4,65535,110,10,4,65535,111,128,4,65535,112,129,4,65535,113,130,4,65535,114,131,4,65535,115,132,4,65535,116,133,4,65535,117,134,4,65535,118,135,4,65535,119,136,4,65535,120,137,17,65535,4294967295,138,31,65535,4294967295,139,32,65535,4294967295,140,17,249,4294967295,141,33,65535,4294967295,142,18,124,4294967295,143,8,65535,4294967295,144,19,126,4294967295,145,9,65535,4294967295,146,20,65535,4294967295,108,23,65535,4294967295,147,13,65535,4294967295,148,20,65535,4294967295,149,20,124,4294967295,150,21,65535,4294967295,151,21,126,4294967295,152,34,65535,4294967295,153,35,65535,4294967295,154,22,65535,4294967295,155,22,142,4294967295,156,36,65535,4294967295,157,23,65535,4294967295,158,24,65535,4294967295,159,24,65535,4294967295,160,37,65535,4294967295,161,24,65535,4294967295,162,24,124,4294967295,163,38,65535,4294967295,164,39,65535,4294967295,165,25,65535,4294967295,166,25,126,4294967295,167,40,65535,4294967295,168,34,65535,4294967295,169,41,65535,4294967295,170,42,65535,4294967295,112,26,65535,4294967295,171,26,65535,4294967295,112,26,65535,4294967295,172,43,65535,4294967295,173,44,65535,4294967295,174,27,65535,4294967295,175,27,142,4294967295,176,28,142,4294967295,177,45,65535,4294967295,178,10,65535,4294967295,179,29,333,4294967295,180,46,65535,4294967295,181,15,65535,4294967295,182,47,65535,4294967295,183,30,65535,4294967295,184,30,142,4294967295,45,10,65535,121,185,11,65535,122,3,3,65535,123,2,2,65535,124,186,4,65535,125,187,4,65535,126,188,4,65535,127,189,4,65535,128,10,4,65535,129,10,4,65535,130,190,4,65535,131,10,4,65535,132,191,4,65535,133,192,4,65535,134,10,4,65535,135,193,4,65535,136,10,4,65535,137,194,48,65535,138,195,32,65535,4294967295,196,31,65535,4294967295,197,31,364,4294967295,198,32,65535,4294967295,199,17,65535,4294967295,200,49,65535,4294967295,201,32,65535,4294967295,202,32,364,4294967295,203,50,65535,4294967295,204,51,65535,4294967295,205,17,65535,4294967295,206,17,364,4294967295,207,17,65535,4294967295,208,18,65535,4294967295,209,33,65535,4294967295,210,33,65535,4294967295,2,2,65535,139,211,18,65535,4294967295,212,8,65535,4294967295,213,19,65535,4294967295,214,9,65535,4294967295,215,52,65535,4294967295,216,53,65535,4294967295,217,20,65535,4294967295,218,54,65535,4294967295,219,21,65535,4294967295,220,55,65535,4294967295,221,56,65535,4294967295,168,34,65535,4294967295,222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_(report truncated; full output in workflow logs)_

Keep the generated-code compatibility diagnostic snapshot focused on the error message and source location. Rustc caret widths depend on the package version embedded in the generated macro invocation, so pinning renderer detail made release version-length changes fail unrelated tests.
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Recovered the completed Claude review from run 30700759411's artifact because its GitHub token expired before updating the sticky comment. Addressed its one finding in d95d71e: the mismatch snapshot now pins only the error message and source location, removing package-version-dependent caret width and rustc renderer detail. Verified with all 62 antlr4_rust_gen_cli tests, CI-equivalent clippy, and cargo fmt --check.

Anchor nested cargo stderr extraction on the generated-code mismatch error so unrelated dependency warnings cannot shift the snapshot. Also tie the diagnostic's supported-revision text to the runtime API constant with an explicit property assertion.
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Addressed both non-blocking Claude items in 2124326: stderr extraction now anchors on the first error line before taking the message and location, and the test explicitly asserts that the diagnostic names antlr4_runtime::__ANTLR4_RUST_CODEGEN_API. Verified with all 62 antlr4_rust_gen_cli tests, CI-equivalent clippy, and cargo fmt --check.

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@codex review

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Codex Review: Didn't find any major issues. 🎉

Reviewed commit: 212432637c

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codegen: enforce generated-source/runtime compatibility at compile time

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