Merge c048ec9faf4bfe02da004dce69471897933c3617 into 6dd3a6dbb3dd26342ba143724330ab802baf897c

Problem: When an exception occurs in a WITH block, __exit__ was not called,
preventing proper cleanup of context managers.

Solution:
1. Wrap WITH block body in try-except structure
2. On normal exit: call __exit__(None, None, None)
3. On exception: call __exit__ with exception info before re-raising

Changes:
- compiler.c: Wrap WITH body in try-except, ensure __exit__ called in both paths
- ceval.c: Update OP_WITH_EXIT to accept three arguments (exc_type, exc_val, exc_tb)
- tests/520_context.py: Add test to verify __exit__ called on exceptions

docs/gsoc2026/guide.md

@@ -7,7 +7,7 @@ label: "Application Guide"
 Welcome to the Google Summer of Code 2026 application guide for pocketpy.
 We are recruiting a student who is passionate about vibe coding and mobile game development.
 
-See [Project Ideas (TBA)](./ideas.md) for more details about the project.
+See [Project Ideas](./ideas.md) for more details about the project.
 
 ## Prerequisites
 
@@ -16,7 +16,7 @@ To apply for this project, you need to satisfy the following prerequisites:
 + You are a student enrolled in an accredited institution (university, college, etc.) pursuing a degree in computer science or a related field. And this is your first time participating in Google Summer of Code.
 + You have interest in vibe coding and mobile game development.
 + You are experienced in [Python](https://www.python.org/) and backend technologies, such as [FastAPI](https://fastapi.tiangolo.com/) or [Flask](https://flask.palletsprojects.com/).
-+ You are glad to learn mobile app development using frameworks like [Flutter](https://flutter.dev/).
++ You are glad to learn game engines like [Godot](https://godotengine.org/).
 
 ## Application steps
 

docs/gsoc2026/ideas.md

@@ -7,7 +7,7 @@ label: "Project Ideas"
 
 ## Idea Title
 
-Build a Vibe Coding Agent in Python for Creating Mobile Games
+Build a Vibe Coding Agent in Python for Creating Games
 
 ## Project Size
 
@@ -18,14 +18,14 @@ Medium
 - CPython
 - Agentic Programming
 - Prompt Engineering
-- PIXI.JS Framework
+- Game Engines
 
 ## Description
 
 pocketpy is an organization dedicated to creating game development tools in Python language.
 Nowadays, vibe coding has become a popular approach for rapid game development, allowing developers to create games quickly and efficiently by leveraging language models and agentic programming techniques.
 
-For Google Summer of Code 2026, we are looking for a student to develop a vibe coding agent that can assist developers in creating mobile games.
+For Google Summer of Code 2026, we are looking for a student to develop a vibe coding agent that can assist developers in creating games.
 This agent is composed of two main components,
 backend and frontend.
 
@@ -36,11 +36,6 @@ which is composed of the following modules:
 + AI Service Provider. This module is responsible for communicating with AI service providers, such as OpenAI, to generate code and assets based on user prompts.
 + Persistent Memory. This module stores the state of each vibe coding project, including project progress, user preferences, and other relevant information.
 + Agentic Core. This module uses Persistent Memory and AI Service Provider to implement the agentic programming logic, enabling the agent to understand user prompts and generate appropriate code and assets.
-+ PIXI.JS Integration. We decide to use [PIXI.JS](https://pixijs.com/) as the default rendering engine for user projects. This is because PIXI.JS is fully source-driven,
-which makes it easier for the agent to generate and modify game code.
-
-The frontend part is optional. Knowing this could help students better understand the whole project.
-We aims to create a mobile app using Flutter framework. This app invodes backend services via RESTful APIs,
-and provides a user-friendly interface for users to control and run their vibe coding projects.
++ Game Engine Integration.
 
 For more details, we will discuss with the selected student during the community bonding period.

src/compiler/compiler.c

@@ -2801,6 +2801,8 @@ static Error* compile_stmt(Compiler* self) {
         case TK_WITH: {
             check(EXPR(self));  // [ <expr> ]
             Ctx__s_emit_top(ctx());
+            // Save context manager for later __exit__ call
+            Ctx__emit_(ctx(), OP_DUP_TOP, BC_NOARG, prev()->line);
             Ctx__enter_block(ctx(), CodeBlockType_WITH);
             NameExpr* as_name = NULL;
             if(match(TK_AS)) {
@@ -2809,17 +2811,33 @@ static Error* compile_stmt(Compiler* self) {
                 as_name = NameExpr__new(prev()->line, name, name_scope(self));
             }
             Ctx__emit_(ctx(), OP_WITH_ENTER, BC_NOARG, prev()->line);
-            // [ <expr> <expr>.__enter__() ]
             if(as_name) {
                 bool ok = vtemit_store((Expr*)as_name, ctx());
                 vtdelete((Expr*)as_name);
                 if(!ok) return SyntaxError(self, "invalid syntax");
             } else {
-                // discard `__enter__()`'s return value
                 Ctx__emit_(ctx(), OP_POP_TOP, BC_NOARG, BC_KEEPLINE);
             }
+            // Wrap body in try-except to ensure __exit__ is called even on exception
+            Ctx__enter_block(ctx(), CodeBlockType_TRY);
+            Ctx__emit_(ctx(), OP_BEGIN_TRY, BC_NOARG, prev()->line);
             check(compile_block_body(self));
+            Ctx__emit_(ctx(), OP_END_TRY, BC_NOARG, BC_KEEPLINE);
+            // Normal exit: call __exit__(None, None, None)
+            Ctx__emit_(ctx(), OP_LOAD_NONE, BC_NOARG, prev()->line);
+            Ctx__emit_(ctx(), OP_LOAD_NONE, BC_NOARG, prev()->line);
+            Ctx__emit_(ctx(), OP_LOAD_NONE, BC_NOARG, prev()->line);
             Ctx__emit_(ctx(), OP_WITH_EXIT, BC_NOARG, prev()->line);
+            int jump_patch = Ctx__emit_(ctx(), OP_JUMP_FORWARD, BC_NOARG, BC_KEEPLINE);
+            Ctx__exit_block(ctx());
+            // Exception handler: call __exit__ with exception info, then re-raise
+            Ctx__emit_(ctx(), OP_PUSH_EXCEPTION, BC_NOARG, BC_KEEPLINE);
+            Ctx__emit_(ctx(), OP_LOAD_NONE, BC_NOARG, BC_KEEPLINE);  // exc_type
+            Ctx__emit_(ctx(), OP_ROT_TWO, BC_NOARG, BC_KEEPLINE);     // reorder: [cm, None, exc]
+            Ctx__emit_(ctx(), OP_LOAD_NONE, BC_NOARG, BC_KEEPLINE);  // exc_tb
+            Ctx__emit_(ctx(), OP_WITH_EXIT, BC_NOARG, prev()->line);
+            Ctx__emit_(ctx(), OP_RE_RAISE, BC_NOARG, BC_KEEPLINE);
+            Ctx__patch_jump(ctx(), jump_patch);
             Ctx__exit_block(ctx());
         } break;
         /*************************************************/

src/interpreter/ceval.c

@@ -1122,14 +1122,35 @@ __NEXT_STEP:
             DISPATCH();
         }
         case OP_WITH_EXIT: {
-            // [expr]
-            py_push(TOP());
+            // Stack: [cm, exc_type, exc_val, exc_tb]
+            // Call cm.__exit__(exc_type, exc_val, exc_tb)
+            py_Ref exc_tb = TOP();
+            py_Ref exc_val = SECOND();
+            py_Ref exc_type = THIRD();
+            py_Ref cm = FOURTH();
+            
+            // Save all values from stack
+            py_TValue saved_cm = *cm;
+            py_TValue saved_exc_type = *exc_type;
+            py_TValue saved_exc_val = *exc_val;
+            py_TValue saved_exc_tb = *exc_tb;
+            self->stack.sp -= 4;
+            
+            // Push cm and get __exit__ method
+            py_push(&saved_cm);
             if(!py_pushmethod(__exit__)) {
-                TypeError("'%t' object does not support the context manager protocol", TOP()->type);
+                TypeError("'%t' object does not support the context manager protocol", saved_cm.type);
                 goto __ERROR;
             }
-            if(!py_vectorcall(0, 0)) goto __ERROR;
-            POP();
+            
+            // Push arguments: exc_type, exc_val, exc_tb
+            PUSH(&saved_exc_type);
+            PUSH(&saved_exc_val);
+            PUSH(&saved_exc_tb);
+            
+            // Call __exit__(exc_type, exc_val, exc_tb)
+            if(!py_vectorcall(3, 0)) goto __ERROR;
+            py_pop();  // discard return value
             DISPATCH();
         }
         ///////////

tests/520_context.py

@@ -27,4 +27,29 @@ assert path == ['enter', 'in', 'exit']
 
 path.clear()
 
+# Test that __exit__ is called even when an exception occurs
+class B:
+    def __init__(self):
+        self.path = []
+    
+    def __enter__(self):
+        path.append('enter')
+        return self
+    
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        path.append('exit')
+        if exc_type is not None:
+            path.append('exception')
+        return False  # propagate exception
+
+try:
+    with B():
+        path.append('before_raise')
+        raise ValueError('test')
+        path.append('after_raise')  # should not be reached
+except ValueError:
+    pass
+
+assert path == ['enter', 'before_raise', 'exit', 'exception'], f"Expected ['enter', 'before_raise', 'exit', 'exception'], got {path}"
+