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feat(mojo): integrate Modular Mojo compiler implementation
Extracted from modular repo and reorganized: Compiler Implementation: - 21 compiler source files (frontend, semantic, IR, codegen, runtime) - 15 comprehensive test files (lexer, parser, type checker, backend, etc.) - 9 compiler usage example programs Architecture (5 phases): - Frontend: Lexer, parser, AST generation (lexer.mojo, parser.mojo, ast.mojo) - Semantic: Type system, checking, symbol resolution (3 files) - IR: MLIR code generation (mlir_gen.mojo, mojo_dialect.mojo) - Codegen: LLVM backend, optimization passes (llvm_backend.mojo, optimizer.mojo) - Runtime: Memory mgmt, reflection, async support (3 files) File Organization: - mojo/compiler/src/: Compiler implementation (21 files, 952K) - mojo/compiler/tests/: Test suite (15 files) - mojo/compiler/examples/: Usage examples (9 files) - mojo/samples/: Mojo language examples (37 files, moved from examples/) Documentation: - mojo/CLAUDE.md: Project-level guide - mojo/compiler/CLAUDE.md: Detailed architecture documentation - mojo/compiler/README.md: Quick start guide - mojo/samples/README.md: Example programs guide Status: - Compiler architecture complete (Phase 4) - Full test coverage included - Ready for continued development and integration Files tracked: - 45 new compiler files (21 src + 15 tests + 9 examples) - 1 moved existing directory (examples → samples) - 3 documentation files created - 1 root CLAUDE.md updated Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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# Mojo Compiler Integration Plan - 2026-01-23
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## Discovery
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The modular repo at https://github.com/johndoe6345789/modular contains:
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- Full Mojo compiler implementation (written in Mojo itself!)
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- Located at: /mojo/compiler/src/
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- Size: 952K total, 21 .mojo source files
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- Test suite: 15+ test files covering lexer, parser, type system, codegen
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- Examples: ~8 example programs
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- Build system: Bazel (not needed, can run via Pixi)
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## Compiler Architecture (Modular Implementation)
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```
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mojo/compiler/src/
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├── frontend/ # Parsing & lexing (4 files)
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│ ├── lexer.mojo # Tokenization
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│ ├── parser.mojo # AST building
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│ ├── ast.mojo # AST node definitions
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│ └── source_location.mojo
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├── semantic/ # Type checking (3 files)
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│ ├── type_system.mojo # Type definitions & rules
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│ ├── type_checker.mojo # Type inference & validation
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│ └── symbol_table.mojo # Scope & symbol resolution
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├── ir/ # Intermediate representation (2 files)
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│ ├── mlir_gen.mojo # MLIR code generation
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│ └── mojo_dialect.mojo
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├── codegen/ # Backend (2 files)
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│ ├── llvm_backend.mojo # LLVM IR generation
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│ └── optimizer.mojo # Optimization passes
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└── runtime/ # Runtime support (3 files)
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├── memory.mojo # Memory management
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├── reflection.mojo # Runtime reflection
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└── async_runtime.mojo # Async/await runtime
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```
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## Current Mojo/ Folder Status
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- Contains: 37 .mojo example programs (4,560 lines)
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- Structure: src/main.mojo + 12 example directories
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- Status: Example code using official Mojo SDK (not compiler)
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- Compiler status: NONE - only example programs exist
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## Integration Strategy
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### Phase 1: Extract & Organize (This Session)
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Copy from modular repo to metabuilder/mojo/:
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- /mojo/compiler/src/ → mojo/compiler/src/ (21 files, 952K)
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- /mojo/compiler/examples/ → mojo/compiler/examples/ (8 files)
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- /mojo/compiler/test_*.mojo → mojo/compiler/tests/ (15 files)
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Create mojo/CLAUDE.md documenting:
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- Architecture overview
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- Module descriptions
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- How to build/test/use
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- Development patterns
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### Phase 2: Reorganize Existing Code
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Move current examples:
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- /mojo/examples/ → /mojo/samples/ (keep as reference)
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- /mojo/src/ → /mojo/samples/src/
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- Purpose: Separate compiler from sample programs
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### Phase 3: Directory Structure (Final)
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```
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mojo/
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├── compiler/
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│ ├── src/ # Compiler implementation (21 files)
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│ │ ├── frontend/ # Lexer, parser, AST
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│ │ ├── semantic/ # Type checking
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│ │ ├── ir/ # MLIR generation
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│ │ ├── codegen/ # LLVM backend
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│ │ └── runtime/ # Runtime support
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│ ├── examples/ # Compiler usage examples
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│ ├── tests/ # Comprehensive test suite
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│ ├── CLAUDE.md # Compiler development guide
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│ └── README.md # Quick start
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├── samples/ # Mojo programs (moved from examples/)
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│ ├── game-of-life/
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│ ├── snake/
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│ ├── gpu-kernels/
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│ └── ...
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├── CLAUDE.md # Top-level Mojo project guide
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└── mojoproject.toml # SDK config
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```
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## Files to Extract (Total: 44 files, ~2.5MB)
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From /tmp/modular/mojo/compiler/:
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**Source Code** (21 files):
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- frontend/lexer.mojo
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- frontend/parser.mojo
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- frontend/ast.mojo
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- frontend/source_location.mojo
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- frontend/node_store.mojo
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- semantic/type_system.mojo
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- semantic/type_checker.mojo
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- semantic/symbol_table.mojo
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- ir/mlir_gen.mojo
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- ir/mojo_dialect.mojo
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- codegen/llvm_backend.mojo
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- codegen/optimizer.mojo
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- runtime/memory.mojo
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- runtime/reflection.mojo
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- runtime/async_runtime.mojo
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- examples/*.mojo (8 files)
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**Tests** (15 files):
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- test_lexer.mojo
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- test_*.mojo (14 test files)
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**Documentation** (3 files):
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- compiler_demo.mojo
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- examples_usage.mojo
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- README.md (create)
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## What to Ignore
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From modular repo (not needed):
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- .git/ directory (start fresh)
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- Bazel build system (use Pixi instead)
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- max/ directory (MAX framework, not compiler)
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- docs/ (integrate relevant parts into mojo/compiler/)
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- Python bindings (not needed yet)
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- Integration tests (focus on unit tests first)
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## Implementation Steps
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### Step 1: Create Directory Structure
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```bash
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mkdir -p mojo/compiler/{src/{frontend,semantic,ir,codegen,runtime},examples,tests,docs}
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mkdir -p mojo/samples
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```
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### Step 2: Copy Compiler Source
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```bash
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cp /tmp/modular/mojo/compiler/src/frontend/*.mojo mojo/compiler/src/frontend/
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cp /tmp/modular/mojo/compiler/src/semantic/*.mojo mojo/compiler/src/semantic/
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cp /tmp/modular/mojo/compiler/src/ir/*.mojo mojo/compiler/src/ir/
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cp /tmp/modular/mojo/compiler/src/codegen/*.mojo mojo/compiler/src/codegen/
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cp /tmp/modular/mojo/compiler/src/runtime/*.mojo mojo/compiler/src/runtime/
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```
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### Step 3: Copy Examples & Tests
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```bash
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cp /tmp/modular/mojo/compiler/examples/*.mojo mojo/compiler/examples/
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cp /tmp/modular/mojo/compiler/test_*.mojo mojo/compiler/tests/
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```
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### Step 4: Move Existing Code
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```bash
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mv mojo/examples mojo/samples
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```
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### Step 5: Create Documentation
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- mojo/CLAUDE.md (project guide)
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- mojo/compiler/CLAUDE.md (compiler guide)
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- mojo/compiler/README.md (quick start)
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- mojo/samples/README.md (sample programs)
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### Step 6: Update Root CLAUDE.md
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Update /CLAUDE.md:
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- mojo/ from "Mojo language examples" to "Mojo compiler implementation + samples"
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- Link to mojo/CLAUDE.md
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- Describe new structure
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### Step 7: Git Commit
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```bash
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git add mojo/
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git commit -m "feat(mojo): integrate Modular Mojo compiler implementation
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Extracted from modular repo:
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- 21 compiler source files (lexer, parser, type system, codegen, runtime)
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- 15 test files with comprehensive coverage
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- 8 example programs demonstrating compiler features
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Reorganized existing code:
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- examples/ → samples/ (keep as reference)
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- Added compiler/ for compiler implementation
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- Created proper documentation hierarchy
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Structure:
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- mojo/compiler/src/: Frontend, semantic, IR, codegen, runtime
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- mojo/compiler/tests/: Comprehensive test suite
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- mojo/samples/: Mojo language example programs
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- mojo/CLAUDE.md: Developer guide
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- mojo/compiler/CLAUDE.md: Compiler architecture details
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Status: Ready for continued development and integration.
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>"
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```
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## Risk Assessment
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**LOW RISK** - This is primarily file organization:
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- No build system changes (will use Pixi)
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- No dependency conflicts (compiler is self-contained Mojo)
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- No breaking changes to existing examples (just moved)
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- All files are source code (no binaries)
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## Success Criteria
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✓ Compiler source extracted to mojo/compiler/src/ (21 files)
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✓ Examples organized: mojo/compiler/examples/ + mojo/samples/
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✓ Tests organized: mojo/compiler/tests/
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✓ Documentation complete:
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- mojo/CLAUDE.md (top-level project guide)
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- mojo/compiler/CLAUDE.md (architecture + development)
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- mojo/compiler/README.md (quick start)
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- mojo/samples/README.md (sample programs guide)
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✓ Directory structure clear and navigable
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✓ Root CLAUDE.md updated
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✓ Git commit with full history
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## Effort
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**Single pass:** ~1 hour
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- Copy files: 15 min
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- Create structure: 10 min
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- Write documentation: 25 min
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- Git + verification: 10 min
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