Provide tau constant (also: τ)

The Tau Manifesto <http://tauday.com/tau-manifesto> See also <https://en.wikipedia.org/wiki/Turn_(geometry)#Tau_proposal> and <http://tauday.com/state-of-the-tau> A patch for S32 is also submitted, as is a spectest.
rakudo · Dec 3, 2015 · c4f8cad · c4f8cad
1 parent 09a3e3d
commit c4f8cad
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/core/Num.pm b/src/core/Num.pm
@@ -234,10 +234,12 @@ my class Num does Real { # declared in BOOTSTRAP
     }
 }
 
-my constant pi = 3.14159_26535_89793_238e0;
-my constant e  = 2.71828_18284_59045_235e0;
+my constant tau = 6.28318_53071_79586_476e0;
+my constant pi  = 3.14159_26535_89793_238e0;
+my constant e   = 2.71828_18284_59045_235e0;
 
 my constant π := pi;
+my constant τ := tau;
 #?if moar
 my constant 𝑒 := e;
 #?endif