Function rustc_ap_rustc_session::build_session_with_source_map

pub fn build_session_with_source_map(
    sopts: Options, 
    local_crate_source_file: Option<PathBuf>, 
    registry: Registry, 
    diagnostics_output: DiagnosticOutput, 
    driver_lint_caps: FxHashMap<LintId, Level>, 
    file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>
) -> (Session, Lrc<SourceMap>)