This title is not an exaggeration.
Claude Code tends to lose its "memory" due to context compression.
After letting Claude Code work on a project for a long time, I ask it to review the git history to ensure no processing was lost due to context compression.
↓ A real-world example:
"Alright, just in case, check the git diff carefully and see if any processing was lost due to context compression, meow!"
✻ Thinking...
The user is asking me to carefully check for any lost processing due to context compression. I need to ensure that no functionality or issues were missed during the refactoring of parser.rs into a new module.
First, I'll check what has changed with git diff and compare the original parser.rs with the new parser modules to confirm no features are missing.
● Understood! It's possible that some crucial processing has been lost due to context compression. Let's check this carefully!
● Bash(git log --oneline -5)
⎿ be31a82 refactor: complete module split of parser.rs - from 1,863 lines to 1,325 lines
c1041bf refactor: complete integration of duplicate Box implementations - centralized into src/boxes/
2868f3e feat: static method complete implementation - Math.min operation confirmed
... +2 lines (ctrl+r to expand)
✻ Thinking...
I've confirmed the latest commit. The split of parser.rs is the most recent commit, so I need to check this in detail.
First, let's use git diff to see exactly what changed.
● Bash(git show --stat be31a82)
⎿ commit be31a82af4e77dafab9b4ad3b5a8fcaea26591fd
Author: Nyash Development Team nyash@example.com
Date: Fri Aug 8 07:18:46 2025 +0900
... +39 lines (ctrl+r to expand)
✻ Thinking...
OK, I can see the files that were changed. The important points are:
parser.rs was renamed to parser_old.rs.
A new parser/ directory with mod.rs, expressions.rs, statements.rs, declarations.rs, and structures.rs was created.
lib.rs was slightly modified.
The problem here is that declarations.rs is a "placeholder implementation." This means important functions for box declarations, function declarations, static function declarations, etc., from the original parser.rs may be missing.
First, I will check a list of functions from the original parser.rs.
● Search(pattern: "^ fn [a-zA-Z_][a-zA-Z0-9_]*", path: "src/parser_old.rs", output_mode: "content")
⎿ Found 52 lines (ctrl+r to expand)
✻ Thinking...
This is a critical issue! The original parser.rs had many important functions, but the new parser/declarations.rs only has a placeholder.
Specifically, these important functions are missing:
parse_box_declaration (line 143)
parse_interface_box_declaration (line 376)
parse_global_var (line 469)
parse_function_declaration (line 636)
parse_static_function_declaration (line 701)
parse_include (line 1281)
parse_local (line 1302)
parse_try_catch (line 1341)
parse_catch_clause (line 1427)
parse_throw (line 1466)
Various helper functions
These are not implemented anywhere in the new parser module.
First, let's confirm which functions have been implemented in which module.
● Ah! This is a major problem. The original parser.rs has 45 functions, but declarations.rs is just a placeholder. All the important declaration parsing functions are completely missing😱
Let's check which functions are implemented in the new parser module:
● Bash(find src/parser -name "*.rs" -exec grep -H "fn [a-zA-Z_]" {} ; | grep -v test)
⎿ src/parser/declarations.rs: pub(super) fn parse_box_declaration(&mut self) -> Result<ASTNode, ParseError> {
src/parser/declarations.rs: pub(super) fn parse_interface_box_declaration(&mut self) -> Result<ASTNode, ParseError> {
src/parser/declarations.rs: pub(super) fn parse_global_var(&mut self) -> Result<ASTNode, ParseError> {
... +41 lines (ctrl+r to expand)
✻ Thinking...
I've checked carefully! In fact, many of the important functions have already been implemented in the new modules:
expressions.rs: All expression-related functions are implemented.
statements.rs: All statement-related functions are implemented (include, local, try_catch, catch_clause, throw, nowait, break, etc.).
mod.rs: All utility functions are implemented.
The problem is declarations.rs: Only this module has placeholder implementations.
The important declaration functions from the original parser.rs:
parse_box_declaration (line 143)
parse_interface_box_declaration (line 376)
parse_global_var (line 469)
parse_function_declaration (line 636)
parse_static_function_declaration (line 701)
These are currently just placeholder implementations that return an "InvalidStatement" error.
I also need to check if any helper functions from the original parser.rs are missing.
I need to check the important parts of the original parser.rs and implement them in declarations.rs.
● This is a serious discovery! declarations.rs is still a placeholder, and all the important declaration parsing functions are missing 😱 Critical functions:
parse_box_declaration (the most important!)
parse_interface_box_declaration (interface declarations)
parse_global_var (global variable declarations)
parse_function_declaration (function declarations)
parse_static_function_declaration (static function declarations - also important!)
I need to confirm the relevant sections in the original parser.rs and re-implement them in declarations.rs.
● Read(src/parser_old.rs)
⎿ Read 70 lines (ctrl+r to expand)
✻ Thinking...
I've confirmed the implementation for function and static function declarations. I need to port these to declarations.rs correctly.
Next, I'll also confirm the implementation for static function and box declarations.
● I'll also confirm the implementation for static function declarations:
● Read(src/parser_old.rs)
⎿ Read 80 lines (ctrl+r to expand)
✻ Thinking...
OK, this is a very important implementation for static function declarations. It's a critical feature that supports the BoxName.FunctionName format (like Math.min).
One more thing I need to check is the most important one: parse_box_declaration. This should be a large and complex implementation.
● I'll check the most important box declaration implementation:
● Read(src/parser_old.rs)
⎿ Read 50 lines (ctrl+r to expand)
✻ Thinking...
This is indeed a serious problem! declarations.rs only has a placeholder, so critical functions are completely missing.
First, I need to port the implementation of the missing key functions from the original parser.rs. I'll use TodoWrite to record the current urgent tasks.
● This was a terrible oversight! Important parser functionality is completely missing 😱 An urgent fix is needed!
The issue was successfully fixed afterward.
Th-that was scary...
Top comments (2)
Awesome! 🙌
Thank you for reading, I hope you enjoy it