Add new semantic analyzer to mypy tests (#3037)

This also removes two redundant definitions in curses/__init__.pyi star-imported from _curses.

.travis.yml

@@ -13,8 +13,16 @@ matrix:
       env:
         - TEST_CMD="./tests/mypy_test.py"
         - INSTALL="mypy"
+    - name: "mypy new analyzer"
+      env:
+        - TEST_CMD="./tests/mypy_test.py -a"
+        - INSTALL="mypy"
     - name: "mypy self test"
       env: TEST_CMD="./tests/mypy_selftest.py"
+    - name: "mypy self test (new analyzer)"
+      env:
+        - NEWSEMANAL=1
+        - TEST_CMD="./tests/mypy_selftest.py"
     - name: "check file consistency"
       env: TEST_CMD="./tests/check_consistent.py"
     - name: "flake8"

stdlib/2and3/curses/__init__.pyi

@@ -1,12 +1,9 @@
-import _curses
 from _curses import *  # noqa: F403
-from typing import TypeVar, Callable, Any, Sequence, Mapping
+from typing import TypeVar, Callable, Any
 
 _T = TypeVar('_T')
 
 LINES: int
 COLS: int
 
-def initscr() -> _curses._CursesWindow: ...
-def start_color() -> None: ...
 def wrapper(func: Callable[..., _T], *arg: Any, **kwds: Any) -> _T: ...

tests/mypy_test.py

@@ -21,6 +21,7 @@ parser = argparse.ArgumentParser(description="Test runner for typeshed. "
                                              "Patterns are unanchored regexps on the full path.")
 parser.add_argument('-v', '--verbose', action='count', default=0, help="More output")
 parser.add_argument('-n', '--dry-run', action='store_true', help="Don't actually run mypy")
+parser.add_argument('-a', '--new-analyzer', action='store_true', help="Use new mypy semantic analyzer")
 parser.add_argument('-x', '--exclude', type=str, nargs='*', help="Exclude pattern")
 parser.add_argument('-p', '--python-version', type=str, nargs='*',
                     help="These versions only (major[.minor])")
@@ -132,6 +133,8 @@ def main():
             flags.append('--no-site-packages')
             flags.append('--show-traceback')
             flags.append('--no-implicit-optional')
+            if args.new_analyzer:
+                flags.append('--new-semantic-analyzer')
             if args.warn_unused_ignores:
                 flags.append('--warn-unused-ignores')
             sys.argv = ['mypy'] + flags + files