Issue #24975 shows that we can easily end up with holes in support from the ast module. We should probably make sure we have a test that goes through the entire stdlib, Does an ast.parse(), and then passes the result to compile() to verify no exceptions are raised. We should either avoid the test/ directory or blacklist specific files which will fail because they are designed to be syntactically incorrect. The test can also be behind a -u flag if it turns out to be an expensive test.