{"id":"e00d62de0e56e950","repo":"rust-lang/cargo","slug":"invalid-package-build-file-name","errorCode":null,"errorMessage":"invalid `package.build` file name","messagePattern":"invalid `package\\.build` file name","errorType":"validation","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"src/workspace/parser/targets.rs","lineNumber":1136,"sourceCode":"                \"`build_file` started as a String and `normalize_path` shouldn't have changed that\",\n            );\n            Ok(Some(TomlPackageBuild::SingleScript(build)))\n        }\n        Some(TomlPackageBuild::Auto(true)) => {\n            Ok(Some(TomlPackageBuild::SingleScript(BUILD_RS.to_owned())))\n        }\n        Some(TomlPackageBuild::MultipleScript(scripts)) => {\n            for script in scripts {\n                validate_build_name(script)?;\n            }\n            Ok(build.cloned())\n        }\n    }\n}\n\nfn validate_build_name(build: &str) -> CargoResult<()> {\n    if Path::new(build).file_stem().is_none() {\n        anyhow::bail!(\"invalid `package.build` file name\");\n    }\n    Ok(())\n}\n\nfn name_or_panic(target: &TomlTarget) -> &str {\n    target\n        .name\n        .as_deref()\n        .unwrap_or_else(|| panic!(\"target name is required\"))\n}\n\nfn validate_lib_name(target: &TomlTarget, warnings: &mut Vec<String>) -> CargoResult<()> {\n    validate_target_name(target, TARGET_KIND_HUMAN_LIB, TARGET_KIND_LIB, warnings)?;\n    let name = name_or_panic(target);\n    if name.contains('-') {\n        anyhow::bail!(\"library target names cannot contain hyphens: {}\", name)\n    }\n","sourceCodeStart":1118,"sourceCodeEnd":1154,"githubUrl":"https://github.com/rust-lang/cargo/blob/0e07a155371a6ce88ae53a2c00df940280c09a67/src/workspace/parser/targets.rs#L1118-L1154","documentation":"Error \"invalid `package.build` file name\" thrown in rust-lang/cargo.","triggerScenarios":"Thrown at src/workspace/parser/targets.rs:1136 when the library encounters an invalid state.","commonSituations":"Occurs when `package.build` points to a file with an invalid name. Use a valid file name such as `build.rs` or a custom path like `build/main.rs`.","solutions":["Use a valid file name for `package.build`, e.g. `build = \"build.rs\"` or another valid `.rs` path.","Remove the `build` key to use the default `build.rs`."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"analyzedSha":"0e07a155371a6ce88ae53a2c00df940280c09a67","analyzedAt":"2026-08-06T01:46:58.334Z","schemaVersion":2}