Fix to exit correctly when quit() or something is called

compiler/erg_common/traits.rs

@@ -10,7 +10,7 @@ use std::vec::IntoIter;
 
 use crate::color::{GREEN, RESET};
 use crate::config::{ErgConfig, Input, BUILD_DATE, GIT_HASH_SHORT, SEMVER};
-use crate::error::{ErrorDisplay, Location, MultiErrorDisplay};
+use crate::error::{ErrorDisplay, ErrorKind, Location, MultiErrorDisplay};
 use crate::ty::Type;
 use crate::Str;
 use crate::{addr_eq, chomp, log, switch_unreachable};
@@ -366,8 +366,17 @@ pub trait Runnable: Sized {
                             output.write_all((out + "\n").as_bytes()).unwrap();
                             output.flush().unwrap();
                         }
-                        Err(e) => {
-                            e.fmt_all_stderr();
+                        Err(errs) => {
+                            if errs
+                                .first()
+                                .map(|e| e.core().kind == ErrorKind::SystemExit)
+                                .unwrap_or(false)
+                            {
+                                instance.finish();
+                                log!(f output, "{GREEN}[DEBUG] The REPL has finished successfully.{RESET}\n");
+                                process::exit(0);
+                            }
+                            errs.fmt_all_stderr();
                         }
                     }
                     output.write_all(instance.ps1().as_bytes()).unwrap();

compiler/erg_compiler/error.rs

@@ -198,6 +198,23 @@ impl CompileError {
             caused_by,
         )
     }
+
+    pub fn system_exit() -> Self {
+        Self::new(
+            ErrorCore::new(
+                0,
+                SystemExit,
+                Location::Unknown,
+                switch_lang!(
+                    "japanese" => format!("システムを終了します"),
+                    "english" => format!("system is exiting"),
+                ),
+                None,
+            ),
+            Input::Dummy,
+            "".into(),
+        )
+    }
 }
 
 #[derive(Debug)]

src/dummy.rs

@@ -104,6 +104,9 @@ impl Runnable for DummyVM {
                 match self.stream.as_mut().unwrap().read(&mut buf) {
                     Result::Ok(n) => {
                         let s = std::str::from_utf8(&buf[..n]).unwrap();
+                        if s == "[Exception] SystemExit" {
+                            return Err(CompileErrors::from(CompileError::system_exit()));
+                        }
                         s.to_string()
                     }
                     Result::Err(e) => {

src/scripts/repl_server.py

@@ -25,6 +25,9 @@ while True:
                 __res = str(exec('__importlib.reload(o)'))
             else:
                 __res = str(exec('import o'))
+        except SystemExit:
+            __client_socket.send('[Exception] SystemExit'.encode())
+            continue
         except e:
             __res = str(e)
         __already_loaded = True