From d76ea4f32374a7677b18f0d0f1c07195b0e64d11 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Fri, 9 Aug 2024 10:39:40 +0800
Subject: [PATCH] closes #6549; adds a test case (#23929)

closes #6549
---
 tests/stdlib/tsystem.nim | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/tests/stdlib/tsystem.nim b/tests/stdlib/tsystem.nim
index 21dbdb59d684..f634ce0c236b 100644
--- a/tests/stdlib/tsystem.nim
+++ b/tests/stdlib/tsystem.nim
@@ -4,7 +4,7 @@ discard """
 """
 
 import stdtest/testutils
-import std/assertions
+import std/[assertions, formatfloat]
 
 # TODO: in future work move existing `system` tests here, where they belong
 
@@ -182,3 +182,19 @@ block: # bug #20516
 
   when not defined(js):
     let a = create(Foo)
+
+block: # bug #6549
+  when not defined(js):
+    block:
+      const v = 18446744073709551615'u64
+
+      doAssert $v == "18446744073709551615"
+      doAssert $float32(v) == "1.8446744e+19", $float32(v)
+      doAssert $float64(v) == "1.8446744073709552e+19", $float64(v)
+
+    block:
+      let v = 18446744073709551615'u64
+
+      doAssert $v == "18446744073709551615"
+      doAssert $float32(v) == "1.8446744e+19"
+      doAssert $float64(v) == "1.8446744073709552e+19"