Add fib21 test

test/all.d

@@ -0,0 +1,20 @@
+#!/bin/env rdmd
+
+import std.process;
+import std.conv;
+
+void main(){
+	string fib21(){
+		string r = "";
+		double a = 0;
+		double temp;
+		for(double b = 1; a < 10000; b = temp + b){
+			r ~= a.to!string ~ "\n";
+			temp = a;
+			a = b;
+		}
+		return r;
+	}
+	assert([ "./lox", "test/fib21.lox" ].execute.output == fib21());
+}
+

test/fib21.lox

@@ -0,0 +1,10 @@
+
+var a = 0;
+var temp;
+
+for(var b = 1; a < 10000; b = temp + b){
+	print a;
+	temp = a;
+	a = b;
+}
+