(These lists are incomplete and stolen from the comparison between D, C, C++, etc. It's a good reference TODO though)

Supported

• Functions
  • Function overloading
  • Function delegates
• Arrays
  • Lightweight arrays
  • Resizeable arrays
  • Built-in strings
  • Array slicing
  • Aliases
• OOP
  • Operator overloading
  • Modules
• Performance
• Generic Programming
  • static if
  • is expressions
• Reliability
  • Guaranteed initialization
  • Exception handling
• Compatibility
  • Support all C types
  • Direct access to C
• Other

Unsupported

• Garbage Collection

• Functions
  • Out function parameters
  • Nested functions
  • Function literals
  • Dynamic closures
  • Typesafe variadic arguments
• Arrays
  • Array bounds checking
  • Associative arrays
  • Strong typedefs (maybe supported?)
  • String switches (maybe supported?)
• OOP
  • Interfaces
  • Nested classes (maybe supported?)
  • Inner (adaptor) classes
  • Covariant return types
  • Properties
• Performance
  • Inline assembler
• Generic Programming
  • Class Templates
  • Function Templates
  • Partial and Explicit Specialization
  • Value Template Parameters
  • Template Template Parameters
  • Mixins
  • typeof
  • foreach
  • Implicit Type Inference
• Reliability
  • Contract Programming
  • Unit testing
  • Static construction order
  • RAII (automatic destructors)
  • Scope guards
  • try-catch-finally blocks
  • Thread synchronization primitives
• Compatibility
  • Enumerated types
  • Complex and Imaginary (maybe supported?)