3 ms·

It was, five years ago. (C11 provides static_assert.) C was probably one of the first widely-used languages to support such a thing, beside Ada and C++.

• pjmlp 10y ago
  Eiffel did it first.
• wahern 10y ago
  C++ added static_assert with C++11. Though, upon further examination C++11 was published 1 month before C11 (September and October, respectively). I guess your point still stands.