chore: adding part of ruff RET

pyproject.toml

@@ -117,6 +117,7 @@ extend-select = [
     "PT",    # flake8-pytest-style
     "PYI",   # flake8-pyi
     "Q",     # flake8-quotes
+    "RET",   # flake8-return
     "RSE",   # flake8-raise
     "RUF",   # Ruff-specific rules
     "SIM",   # flake8-simplify
@@ -137,6 +138,10 @@ ignore = [
     "SIM103",  # returning negated value directly not ideal for long chain
     "SIM105",  # try/except is faster than contextlib.suppress
     "TRY003",  # long messages outside exception class
+    "RET505",  # unused else/elif after return
+    "RET506",  # unused else/elif after raise
+    "RET507",  # unused else/elif after continue
+    "RET508",  # unused else/elif after break
 ]
 flake8-comprehensions.allow-dict-calls-with-keyword-arguments = true
 flake8-unused-arguments.ignore-variadic-names = true

src/packaging/_parser.py

@@ -310,7 +310,7 @@ def _parse_marker_item(tokenizer: Tokenizer) -> MarkerItem:
     return (marker_var_left, marker_op, marker_var_right)
 
 
-def _parse_marker_var(tokenizer: Tokenizer) -> MarkerVar:
+def _parse_marker_var(tokenizer: Tokenizer) -> MarkerVar:  # noqa: RET503
     """
     marker_var = VARIABLE | QUOTED_STRING
     """