Get: go on reading the file after a syntax error, as in WMA

mathics/eval/files_io/files.py

@@ -206,12 +206,17 @@ def eval_Get(
         with Mathics3Open(resolved_path, "r", encoding=encoding) as f:
             feeder = MathicsFileLineFeeder(f, trace_fn)
             while not feeder.empty():
+                lineno = feeder.lineno
                 try:
                     # Note: we use mathics.core.parser.parse
                     # so that tracing/debugging can intercept parse()
                     query = mathics.core.parser.parse(definitions, feeder)
                 except SyntaxError:
-                    return SymbolNull
+                    # As in WMA, report the error and go on reading the
+                    # rest of the file, unless no input was consumed.
+                    if feeder.lineno == lineno:
+                        return SymbolNull
+                    continue
                 finally:
                     feeder.send_messages(evaluation)
                 if query is None:  # blank line / comment

test/builtin/files_io/test_files.py

@@ -67,6 +67,18 @@ def test_get_evaluates_queries_after_error():
     check_evaluation(f'Get["{script_path}"]', "OK!", hold_expected=True)
 
 
+def test_get_continues_after_syntax_error():
+    # As in WMA, Get reports a syntax error and goes on reading the file.
+    script_path = canonic_filename(
+        osp.normpath(
+            osp.join(osp.dirname(__file__), "..", "..", "data", "syntax-error-bug.wl")
+        )
+    )
+    # The syntax message itself is not checked here: its text comes from
+    # Mathics3-scanner.
+    check_evaluation(f'Get["{script_path}"]', "{1, getSyntaxB, 3}")
+
+
 @pytest.mark.skipif(
     sys.platform in ("win32",), reason="$Path does not work on Windows?"
 )

test/data/syntax-error-bug.wl

@@ -0,0 +1,5 @@
+(* Get must go on reading the file after a syntax error, as in WMA. *)
+getSyntaxA = 1;
+getSyntaxB = \[NoSuchCharacterName];
+getSyntaxC = 3;
+{getSyntaxA, getSyntaxB, getSyntaxC}