compile: Don't check for ''break' outside loop' error when in AST only mode

from_cpython/Lib/test/test_ast.py

-# expected: fail
 import sys, itertools, unittest
 from test import test_support
 import ast

src/codegen/irgen/hooks.cpp

@@ -490,9 +490,10 @@ Box* compile(Box* source, Box* fn, Box* type, Box** _args) {
     AST* parsed;
     mod_ty mod;
 
+    ArenaWrapper arena;
+
     if (PyAST_Check(source)) {
         int mode;
-        ArenaWrapper arena;
         if (type_str->s() == "exec")
             mode = 0;
         else if (type_str->s() == "eval")
@@ -502,10 +503,12 @@ Box* compile(Box* source, Box* fn, Box* type, Box** _args) {
         else {
             raiseExcHelper(ValueError, "compile() arg 3 must be 'exec', 'eval' or 'single'");
         }
+        if (only_ast) // nothing to do
+            return source;
+
         mod = PyAST_obj2mod(source, arena, mode);
         if (PyErr_Occurred())
             throwCAPIException();
-        parsed = cpythonToPystonAST(mod, filename_str->c_str());
     } else {
         RELEASE_ASSERT(PyString_Check(source), "");
         int mode;
@@ -521,15 +524,12 @@ Box* compile(Box* source, Box* fn, Box* type, Box** _args) {
 
         PyCompilerFlags cf;
         cf.cf_flags = future_flags;
-        ArenaWrapper arena;
         const char* code = static_cast<BoxedString*>(source)->s().data();
         assert(arena);
         const char* fn = filename_str->c_str();
         mod = PyParser_ASTFromString(code, fn, mode, &cf, arena);
         if (!mod)
             throwCAPIException();
-
-        parsed = cpythonToPystonAST(mod, filename_str->c_str());
     }
 
     if (only_ast) {
@@ -540,6 +540,10 @@ Box* compile(Box* source, Box* fn, Box* type, Box** _args) {
         return result;
     }
 
+    // be careful when moving around this function: it does also do some additional syntax checking (=raises exception),
+    // which we should not do when in AST only mode.
+    parsed = cpythonToPystonAST(mod, filename_str->c_str());
+
     PyCompilerFlags pcf;
     pcf.cf_flags = future_flags;
 

test/CPYTHON_TEST_NOTES.md

@@ -24,7 +24,6 @@ test_al                 No module named al
 test_applesingle        Not really a failure, but it tries to skip itself and we don't support that
 test_argparse           [unknown]
 test_ascii_formatd      segfault in ctypes (but only on CI)
-test_ast                mismatch of parser error checks. remove test/tests/test_ast.py when the orig test passes
 test_asynchat           [unknown]
 test_asyncore           [unknown]
 test_atexit             [unknown]

test/tests/test_ast.expected

-test_AST_objects (__main__.AST_Tests) ... ok
-test_arguments (__main__.AST_Tests) ... ok
-test_base_classes (__main__.AST_Tests) ... ok
-test_classattrs (__main__.AST_Tests) ... ok
-test_field_attr_existence (__main__.AST_Tests) ... ok
-test_field_attr_writable (__main__.AST_Tests) ... ok
-test_from_import (__main__.AST_Tests) ... ok
-test_invalid_identitifer (__main__.AST_Tests) ... ok
-test_invalid_string (__main__.AST_Tests) ... ok
-test_module (__main__.AST_Tests) ... ok
-test_no_fields (__main__.AST_Tests) ... ok
-test_nodeclasses (__main__.AST_Tests) ... ok
-test_non_interned_future_from_ast (__main__.AST_Tests) ... ok
-test_pickling (__main__.AST_Tests) ... skipped 'parse error'
-test_slice (__main__.AST_Tests) ... ok
-test_snippets (__main__.AST_Tests) ... skipped 'parse error'
-test_copy_location (__main__.ASTHelpers_Test) ... ok
-test_dump (__main__.ASTHelpers_Test) ... ok
-test_fix_missing_locations (__main__.ASTHelpers_Test) ... ok
-test_get_docstring (__main__.ASTHelpers_Test) ... ok
-test_increment_lineno (__main__.ASTHelpers_Test) ... ok
-test_iter_child_nodes (__main__.ASTHelpers_Test) ... ok
-test_iter_fields (__main__.ASTHelpers_Test) ... ok
-test_literal_eval (__main__.ASTHelpers_Test) ... ok
-test_literal_eval_issue4907 (__main__.ASTHelpers_Test) ... ok
-test_parse (__main__.ASTHelpers_Test) ... ok
-
-----------------------------------------------------------------------
-Ran 26 tests in TIME
-
-OK (skipped=2)
-