Use _print_exception_bltin in excepthook, register source in linecache

- excepthook: call traceback._print_exception_bltin instead of traceback.print_exception to match PyErr_Display behavior - run_string: register compiled code in linecache._interactive_cache so traceback can display source lines and caret indicators - Remove test_sys_tracebacklimit expectedFailure
RustPython · youknowone · Feb 17, 2026 · Feb 16, 2026 · Feb 17, 2026 · 27390dc54ab59c6f14467f508a18f2fa17d7ceef
commit 27390dc54ab59c6f14467f508a18f2fa17d7ceef
diff --git a/.cspell.dict/cpython.txt b/.cspell.dict/cpython.txt
@@ -11,6 +11,7 @@ badsyntax
 baseinfo
 basetype
 binop
+bltin
 boolop
 BUFMAX
 BUILDSTDLIB

diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
@@ -1232,7 +1232,6 @@ def test_getandroidapilevel(self):
         self.assertIsInstance(level, int)
         self.assertGreater(level, 0)
 
-    @unittest.expectedFailure # TODO: RUSTPYTHON
     @force_not_colorized
     @support.requires_subprocess()
     def test_sys_tracebacklimit(self):

diff --git a/Lib/test/test_warnings/__init__.py b/Lib/test/test_warnings/__init__.py
@@ -1478,7 +1478,6 @@ def test_envvar_and_command_line(self):
         self.assertEqual(stdout,
             b"['ignore::DeprecationWarning', 'ignore::UnicodeWarning']")
 
-    @unittest.expectedFailure  # TODO: RUSTPYTHON; AssertionError: b"['error::DeprecationWarning']" != b"['default::DeprecationWarning', 'error::DeprecationWarning']"
     @force_not_colorized
     def test_conflicting_envvar_and_command_line(self):
         rc, stdout, stderr = assert_python_failure("-Werror::DeprecationWarning", "-c",

diff --git a/crates/vm/src/stdlib/sys.rs b/crates/vm/src/stdlib/sys.rs
@@ -825,11 +825,13 @@ mod sys {
         let stderr = super::get_stderr(vm)?;
         match vm.normalize_exception(exc_type.clone(), exc_val.clone(), exc_tb) {
             Ok(exc) => {
-                // Try Python traceback module first for richer output
-                // (enables features like keyword typo suggestions in SyntaxError)
+                // PyErr_Display: try traceback._print_exception_bltin first
                 if let Ok(tb_mod) = vm.import("traceback", 0)
-                    && let Ok(print_exc) = tb_mod.get_attr("print_exception", vm)
-                    && print_exc.call((exc.as_object().to_owned(),), vm).is_ok()
+                    && let Ok(print_exc_builtin) =
+                        tb_mod.get_attr("_print_exception_bltin", vm)
+                    && print_exc_builtin
+                        .call((exc.as_object().to_owned(),), vm)
+                        .is_ok()
                 {
                     return Ok(());
                 }

diff --git a/crates/vm/src/vm/python_run.rs b/crates/vm/src/vm/python_run.rs
@@ -1,7 +1,8 @@
 //! Python code execution functions.
 
 use crate::{
-    PyResult, VirtualMachine,
+    AsObject, PyRef, PyResult, VirtualMachine,
+    builtins::PyCode,
     compiler::{self},
     scope::Scope,
 };
@@ -22,9 +23,22 @@ impl VirtualMachine {
         let code_obj = self
             .compile(source, compiler::Mode::Exec, source_path)
             .map_err(|err| self.new_syntax_error(&err, Some(source)))?;
+        // linecache._register_code(code, source, filename)
+        let _ = self.register_code_in_linecache(&code_obj, source);
         self.run_code_obj(code_obj, scope)
     }
 
+    /// Register a code object's source in linecache._interactive_cache
+    /// so that traceback can display source lines and caret indicators.
+    fn register_code_in_linecache(&self, code: &PyRef<PyCode>, source: &str) -> PyResult<()> {
+        let linecache = self.import("linecache", 0)?;
+        let register = linecache.get_attr("_register_code", self)?;
+        let source_str = self.ctx.new_str(source);
+        let filename = self.ctx.new_str(code.source_path().as_str());
+        register.call((code.as_object().to_owned(), source_str, filename), self)?;
+        Ok(())
+    }
+
     #[deprecated(note = "use run_string instead")]
     pub fn run_code_string(&self, scope: Scope, source: &str, source_path: String) -> PyResult {
         self.run_string(scope, source, source_path)
-Original file line number
+Diff line change
@@ Expand Up / @@ -11,6 +11,7 @@ badsyntax @@
     baseinfo
     basetype
     binop
+    bltin
     boolop
     BUFMAX
     BUILDSTDLIB
@@ Expand Down @@