{"record":{"id":"c1a00972521c184b","repo":"BoundaryML/baml","slug":"failed-to-serialize-baml-bytecode-e","errorCode":null,"errorMessage":"failed to serialize BAML bytecode: {e}","messagePattern":"failed to serialize BAML bytecode: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"baml_language/crates/baml_cli/src/generate.rs","lineNumber":352,"sourceCode":"                eprintln!(\"  [generator.my_client]\");\n                eprintln!(\"  output_type = \\\"python/pydantic\\\"\");\n                eprintln!(\"  output_dir = \\\"../python\\\"\");\n                eprintln!(\"  naming_convention = \\\"preserve-case\\\"\");\n            }\n            return Ok(crate::ExitCode::Other);\n        }\n\n        let embedded_baml_toml = build_embedded_baml_toml(&from)?;\n\n        // Build the codegen SymbolPool from the compiler database.\n        let pool = baml_ide::build_symbol_pool(&db);\n\n        reporter.spin(\"Compiling\", format!(\"{} file(s)\", source_files.len()));\n        let program = db\n            .get_bytecode(package)\n            .map_err(|e| anyhow!(\"compilation failed: {e:?}\"))?;\n        let baml_bytecode = baml_artifact::encode(baml_artifact::ArtifactKind::Program, &program)\n            .map_err(|e| anyhow!(\"failed to serialize BAML bytecode: {e}\"))?;\n        let source_root = from.join(\"baml_src\");\n        let user_baml_files = source_files\n            .iter()\n            .map(|source_file| {\n                let path = source_file.path(&db);\n                let relative_path = path\n                    .strip_prefix(&source_root)\n                    .or_else(|_| path.strip_prefix(&from))\n                    .with_context(|| {\n                        format!(\n                            \"BAML source {} is outside project root {}\",\n                            path.display(),\n                            from.display()\n                        )\n                    })?;\n                Ok((\n                    relative_path.to_path_buf(),\n                    source_file.text(&db).to_string(),","sourceCodeStart":334,"sourceCodeEnd":370,"githubUrl":"https://github.com/BoundaryML/baml/blob/bd85ce9dee1463ff04d27efd20531013a4ff46c1/baml_language/crates/baml_cli/src/generate.rs#L334-L370","documentation":"After successful compilation, `baml generate` encodes the program into BAML bytecode with `baml_artifact::encode(ArtifactKind::Program, ...)`. If serialization fails, the underlying error is wrapped in this message. Unlike compilation errors this indicates an internal encoding failure rather than a user-source problem.","triggerScenarios":"`baml_artifact::encode` returning Err for the compiled program — e.g. an artifact-encoding invariant violated by some construct in the program, or a bug in the artifact encoder version.","commonSituations":"Hitting a compiler/codegen bug with an unusual BAML construct; a version mismatch between the compiler database and the baml_artifact crate in a locally patched build.","solutions":["Retry after updating the BAML CLI to the latest version — encoding bugs are usually fixed upstream.","Reduce the failing .baml file to a minimal repro and file a bug with the BAML project including the encoded error message.","If building from source, ensure baml_compiler and baml_artifact crates are from the same commit (no mixed versions).","As a workaround, bisect your baml_src files to find the construct that breaks encoding."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"match run_generate() {\n  Err(e) if e.to_string().contains(\"failed to serialize BAML bytecode\") => {\n    eprintln!(\"encoder bug — update CLI or file a minimal repro: {e:#}\");\n  }\n  Err(e) => eprintln!(\"{e:#}\"),\n  Ok(_) => {}\n}","preventionTips":["Keep the BAML CLI up to date; encoder bugs are fixed upstream.","If building from source, never mix baml_artifact and compiler crates from different commits.","Commit .baml files incrementally so a reproducible failing construct is easy to bisect.","Report minimal repros to the BAML repo when this error appears."],"tags":["serialization","internal","baml"],"backgroundTag":"json-serialization-failed","analyzedSha":"bd85ce9dee1463ff04d27efd20531013a4ff46c1","analyzedAt":"2026-09-12T03:38:25.718Z","contentChangedAt":"2026-09-12T03:38:25.718Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}