Use _run_module_as_main instead of run_module (#1720)

Author: slozier

.editorconfig

@@ -81,6 +81,7 @@ dotnet_diagnostic.CA1845.severity = none        # CA1845: Use span-based 'string
 dotnet_diagnostic.CA1846.severity = none        # CA1846: Prefer 'AsSpan' over 'Substring'
 dotnet_diagnostic.CA1847.severity = none        # CA1847: Use char literal for a single character lookup
 dotnet_diagnostic.CA1852.severity = suggestion  # CA1852: Seal internal types
+dotnet_diagnostic.CA1859.severity = suggestion  # CA1859: Use concrete types when possible for improved performance
 dotnet_diagnostic.CA2101.severity = suggestion  # CA2101: Specify marshaling for P/Invoke string arguments
 dotnet_diagnostic.CA2201.severity = none        # CA2201: Do not raise reserved exception types
 dotnet_diagnostic.CA2208.severity = suggestion  # CA2208: Instantiate argument exceptions correctly

Src/IronPython/Hosting/PythonCommandLine.cs

@@ -87,21 +87,29 @@ protected override int Run() {
                     return -1;
                 }
 
-                // get the run_module method
+                // get the _run_module_as_main method
                 try {
-                    runMod = PythonOps.GetBoundAttr(PythonContext.SharedContext, runpy, "run_module");
+                    runMod = PythonOps.GetBoundAttr(PythonContext.SharedContext, runpy, "_run_module_as_main");
                 } catch (Exception) {
-                    Console.WriteLine("Could not access runpy.run_module", Style.Error);
+                    Console.WriteLine("Could not access runpy._run_module_as_main", Style.Error);
                     return -1;
                 }
 
+                if (Scope == null) {
+                    Scope = CreateScope();
+                }
+
+                var argv = PythonContext.GetSystemStateValue("argv") as PythonList;
+                if (argv is not null) {
+                    argv[0] = "-m";
+                }
+
                 // call it with the name of the module to run
                 try {
-                    PythonCalls.CallWithKeywordArgs(
+                    PythonCalls.Call(
                         PythonContext.SharedContext,
                         runMod,
-                        new object[] { Options.ModuleToRun, "__main__", ScriptingRuntimeHelpers.True },
-                        new string[] { "run_name", "alter_sys" }
+                        Options.ModuleToRun
                     );
                 } catch (SystemExitException e) {
                     return GetEffectiveExitCode(e);