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docs/todo.md

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+## Todo
+
+### Compiler
+
+- [x] Tokenizer
+- [x] Scanner
+- [x] Functions
+- [x] Variables
+- [x] Error messages
+- [x] Expression parser
+- [x] Function calls
+- [x] Parallel compilation
+- [x] Syscalls
+- [x] Variable lifetimes
+- [x] Branches
+- [x] Loops
+- [x] Hexadecimal, octal and binary literals
+- [x] Escape sequences
+- [x] Multiple return values
+- [ ] Type system
+- [ ] Type operator `?`
+- [ ] Data structures
+- [ ] Slices
+- [ ] Floating-point arithmetic
+- [ ] Error handling
+- [ ] Threading library
+- [ ] Self-hosted compiler
+
+### Keywords
+
+- [x] `assert`
+- [x] `else`
+- [ ] `for`
+- [x] `if`
+- [x] `import`
+- [x] `loop`
+- [x] `return`
+- [x] `switch`
+
+### Optimizations
+
+- [x] Exclude unused functions
+- [x] Constant folding
+- [ ] Constant propagation
+- [ ] Function call inlining
+- [ ] Loop unrolls
+- [ ] Assembler optimization backend
+
+### Linter
+
+- [x] Unused variables
+- [x] Unused parameters
+- [x] Unused imports
+- [ ] Unnecessary newlines
+- [ ] Ineffective assignments
+
+### Operators
+
+- [x] `=`, `:=`
+- [x] `+`, `-`, `*`, `/`, `%`
+- [x] `+=`, `-=`, `*=`, `/=`, `%=`
+- [x] `&`, `|`, `^`
+- [x] `&=`, `|=`, `^=`
+- [x] `<<`, `>>`
+- [x] `<<=`, `>>=`
+- [x] `==`, `!=`, `<`, `<=`, `>`, `>=`
+- [x] `&&`, `||`
+- [ ] `!`, `-`
+
+### Architecture
+
+- [ ] arm64
+- [ ] riscv
+- [x] x64
+
+### Platform
+
+- [x] Linux
+- [x] Mac
+- [ ] Windows