From abf8ee049a00676e2b45faaf79b5eff44f20f467 Mon Sep 17 00:00:00 2001
From: Koki Fushimi <paalon1936@gmail.com>
Date: Mon, 4 Jun 2018 16:48:11 +0900
Subject: [PATCH] Broaden the argument types

---
 lib/pure/math.nim | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/pure/math.nim b/lib/pure/math.nim
index cd7bf5fe2e..9cadfb6b74 100644
--- a/lib/pure/math.nim
+++ b/lib/pure/math.nim
@@ -148,8 +148,13 @@ else: # JS
   proc ln*(x: float32): float32 {.importc: "Math.log", nodecl.}
   proc ln*(x: float64): float64 {.importc: "Math.log", nodecl.}
 
-proc log*[T: SomeFloat](b, x: T): T = ln(x) / ln(b)
+proc log*[B, X: SomeFloat](b: B, x: X): auto =
   ## Computes the logarithm base ``b`` of ``x``
+  when B is float64 or X is float64
+    var r: float64
+  else:
+    var r: float32
+  result = ln(x) / ln(b)
 
 when not defined(JS): # C
   proc log10*(x: float32): float32 {.importc: "log10f", header: "<math.h>".}