#23015 SingleSourceField can't be hydrated Issue created by mtruscello Describe the bug: SingleSourceField can't be hydrated, making indirect addresses and code generation impossible. Pants version: 2.30 OS Affects all OS. Additional info Discovered as part of #22978. The root cause appears to be that validate_resolved_files is called too early during hydrate_sources. SingleSourceField has expected_num_files=1. Unless it points to an actual file, the validate_resolved_files call after glob expansion will always results in it matching zero files. resolve_target and generate_sources aren't called until afterwards, so there's no way for this field type to actually make use of them. pantsbuild/pants