bug fixes and performance improvements

src/pipeline/error/mod.rs

@@ -0,0 +1,15 @@
+mod project_error;
+mod parse_error_with_path;
+mod unexpected_directory;
+mod module_not_found;
+mod not_exported;
+mod too_many_supers;
+mod visibility_mismatch;
+
+pub use project_error::{ErrorPosition, ProjectError};
+pub use parse_error_with_path::ParseErrorWithPath;
+pub use unexpected_directory::UnexpectedDirectory;
+pub use module_not_found::ModuleNotFound;
+pub use not_exported::NotExported;
+pub use too_many_supers::TooManySupers;
+pub use visibility_mismatch::VisibilityMismatch;