From c4f8cad5146c8f2886a1854165891de014e8b897 Mon Sep 17 00:00:00 2001
From: Juerd Waalboer <juerd@tnx.nl>
Date: Thu, 3 Dec 2015 13:44:56 +0100
Subject: [PATCH] =?UTF-8?q?Provide=20tau=20constant=20(also:=20=CF=84)?=
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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.
---
 src/core/Num.pm | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/core/Num.pm b/src/core/Num.pm
index d1ebfb82a94..a1fae8bb5db 100644
--- 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