gistfile1.d

module gl.gl;
enum : uint
{
	MAX_TESS_CONTROL_OUTPUT_COMPONENTS = 0x8E83,
	ONE_MINUS_SRC_ALPHA = 0x0303,
	STENCIL_BACK_FUNC = 0x8800,
	AND_REVERSE = 0x1502,
	....


module gl.error;
import gl = gl.gl;

	immutable string[uint] errorMessageMap = [
		gl.NO_ERROR : "No error",
		gl.INVALID_ENUM : "Invalid enum",
		gl.INVALID_VALUE : "Invalid value",
		gl.INVALID_OPERATION : "Invalid operation",
		gl.STACK_OVERFLOW : "Stack overflow",
		gl.STACK_UNDERFLOW : "Stack underflow",
		gl.OUT_OF_MEMORY : "Out of memory"
	];

gistfile2.txt

render/gl/error.d(11): Error: non-constant expression [0u:"No error",1280u:"Invalid enum",1281u:"Invalid value",1282u:"Invalid operation",1283u:"Stack overflow",1284u:"Stack underflow",1285u:"Out of memory"]