2 files changed, 17 insertions, 1 deletions
diff --git a/tests/float/tfloat4.nim b/tests/float/tfloat4.nim
index d7783ce26..559c8aaca 100644
--- a/tests/float/tfloat4.nim
+++ b/tests/float/tfloat4.nim
@@ -9,7 +9,7 @@ proc c_sprintf(buf, fmt: cstring) {.importc:"sprintf", header: "<stdio.h>", vara
 
 proc floatToStr(f: float64): string =
   var buffer: array[128, char]
-  c_sprintf(buffer, "%.16e", f)
+  c_sprintf(addr buffer, "%.16e", f)
   result = ""
   for ch in buffer:
     if ch == '\0':
diff --git a/tests/float/tfloatnan.nim b/tests/float/tfloatnan.nim
new file mode 100644
index 000000000..aa288d342
--- /dev/null
+++ b/tests/float/tfloatnan.nim
@@ -0,0 +1,16 @@
+discard """
+  file: "tfloatnan.nim"
+  output: '''Nim: nan
+Nim: nan (float)
+Nim: nan (double)
+'''
+"""
+
+let f = NaN
+echo "Nim: ", f
+
+let f32: float32 = NaN
+echo "Nim: ", f32, " (float)"
+
+let f64: float64 = NaN
+echo "Nim: ", f64, " (double)"