Three Unlikely Successful Features of D

[dsimcha]

1.  Scope guards.  The need to execute some code at the end of a
scope is pervasive and has led to about a zillion workarounds
from gotos in C to RAII in C++ to try/finally in Java and C# to
with statements in Python.  D is the only language I know of that
lets the programmer specify such a simple and common intention
directly.

2.  CTFE.  There's a certain elegance to having most of the
language available at compile time and it seems like there's no
shortage of creative uses for this.

3.  Static if.  This is the most important feature for converting
template metaprogramming from an esoteric form of sorcery to a
practical, readable tool for the masses.  Most of the compile time
introspection D provides would be almost unusable without it.