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-# Parser Implementation Analysis
-
-## Grammar vs Implementation Comparison
-
-### 1. Assignment Parsing Issue
-
-**Grammar Rule:**
-```
-assignment = identifier ":" assignment_value
-assignment_value = function_call | simple_expression
-```
-
-**Current Implementation Problem:**
-- The parser calls `walk()` to get the value in assignments
-- `walk()` consumes the function name before assignment parsing can detect it as a function call
-- This causes `result : add 3 4;` to be parsed incorrectly
-
-**Expected Parse Tree:**
-```
-assignment(
-  identifier("result"),
-  function_call("add", [number(3), number(4)])
-)
-```
-
-**Actual Parse Tree (from debug output):**
-```
-assignment(
-  identifier("result"),
-  number(3)
-)
-// Plus separate nodes: number(4)
-```
-
-### 2. Function Call Detection
-
-**Grammar Rule:**
-```
-function_call = identifier argument_list
-argument_list = expression { expression }
-```
-
-**Current Implementation Issues:**
-- Function call detection is in the wrong place in the parser
-- Assignment parsing calls `walk()` which consumes tokens before function call detection
-- The condition `tokens[current + 1].type !== TokenType.ASSIGNMENT` prevents function calls in assignments
-
-**Debug Evidence:**
-```
-[DEBUG] Assignment parsing: {
-  "current": { "type": "NUMBER", "value": "3" },
-  "next": { "type": "NUMBER", "value": "4" }
-}
-```
-The parser is already at the `3` token, meaning `add` has been consumed.
-
-### 3. Case Expression Parsing
-
-**Grammar Rule:**
-```
-case_expression = "case" value_list "of" case_list
-case_branch = pattern ":" result
-```
-
-**Current Implementation Status:**
-✅ **Working correctly** - Case expressions parse and structure correctly
-- Patterns are parsed correctly: `0 0`, `0 _`, `_ 0`, `_ _`
-- Results are parsed correctly: string literals, numbers, identifiers
-- The AST structure matches the grammar
-
-### 4. Arithmetic Expression Parsing
-
-**Grammar Rule:**
-```
-arithmetic_expression = arithmetic_operator expression expression
-```
-
-**Current Implementation Status:**
-✅ **Working correctly** - Prefix notation is handled correctly
-- `+ x y` parses as `PlusExpression(left: x, right: y)`
-- Operator precedence is handled correctly
-
-### 5. IO Statement Parsing
-
-**Grammar Rule:**
-```
-io_statement = io_operator [ expression ]
-io_operator = "..in" | "..out"
-```
-
-**Current Implementation Status:**
-✅ **Working correctly** - IO statements parse correctly
-- `..in` and `..out` are recognized as special tokens
-- Expressions after `..out` are parsed correctly
-
-## Root Cause Analysis
-
-The fundamental issue is in the parser architecture:
-
-1. **Assignment parsing calls `walk()`** to get the value
-2. **`walk()` consumes tokens** before assignment parsing can analyze them
-3. **Function call detection happens too late** in the parsing process
-
-## Proposed Solutions
-
-### Solution 1: Restructure Assignment Parsing
-Don't call `walk()` for assignment values. Instead, directly parse the value:
-
-```javascript
-// Instead of: const value = walk();
-// Do: Parse value directly based on next tokens
-```
-
-### Solution 2: Add Function Call Detection to walk()
-Make `walk()` detect function calls when it encounters an identifier followed by arguments:
-
-```javascript
-if (token.type === TokenType.IDENTIFIER) {
-    // Check for function call first
-    if (isFunctionCall()) {
-        return parseFunctionCall();
-    }
-    // Then check for assignment
-    if (isAssignment()) {
-        return parseAssignment();
-    }
-}
-```
-
-### Solution 3: Use Lookahead
-Implement a lookahead mechanism to peek at tokens without consuming them:
-
-```javascript
-function peek(n = 1) {
-    return tokens[current + n];
-}
-```
-
-## Recommended Approach
-
-**Solution 1** is the most straightforward. The assignment parsing should directly parse the value without calling `walk()`, allowing it to distinguish between function calls and simple expressions.
-
-This would fix the core issue and make the parser match the grammar specification. 
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