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-rw-r--r--tests/float/tfloat4.nim12
-rw-r--r--tests/float/tfloats.nim8
2 files changed, 12 insertions, 8 deletions
diff --git a/tests/float/tfloat4.nim b/tests/float/tfloat4.nim
index 5bedca371..2bb61eb58 100644
--- a/tests/float/tfloat4.nim
+++ b/tests/float/tfloat4.nim
@@ -8,7 +8,7 @@ proc c_sprintf(buf, fmt: cstring) {.importc:"sprintf", header: "<stdio.h>", vara
 
 proc floatToStr(f: float64): string =
   var buffer: array[128, char]
-  c_sprintf(addr buffer, "%.16e", f)
+  c_sprintf(cast[cstring](addr buffer), "%.16e", f)
   result = ""
   for ch in buffer:
     if ch == '\0':
@@ -56,8 +56,14 @@ doAssert 0.9999999999999999 == ".9999999999999999".parseFloat
 
 # bug #18400
 var s = [-13.888888'f32]
-assert $s[0] == "-13.888888"
+doAssert $s[0] == "-13.888888"
 var x = 1.23456789012345'f32
-assert $x == "1.2345679"
+doAssert $x == "1.2345679"
+
+# bug #21847
+doAssert parseFloat"0e+42" == 0.0
+doAssert parseFloat"0e+42949672969" == 0.0
+doAssert parseFloat"0e+42949672970" == 0.0
+doAssert parseFloat"0e+42949623223346323563272970" == 0.0
 
 echo("passed all tests.")
diff --git a/tests/float/tfloats.nim b/tests/float/tfloats.nim
index 480396e81..aaed2d615 100644
--- a/tests/float/tfloats.nim
+++ b/tests/float/tfloats.nim
@@ -41,8 +41,7 @@ template main =
     test ".1", 0.1
     test "-.1", -0.1
     test "-0", -0.0
-    when false: # pending bug #18246
-      test "-0", -0.0
+    test "-0", -0'f # see #18246, -0 won't work
     test ".1e-1", 0.1e-1
     test "0_1_2_3.0_1_2_3E+0_1_2", 123.0123e12
     test "0_1_2.e-0", 12e0
@@ -157,9 +156,8 @@ template main =
         when nimvm:
           discard # xxx, refs #12884
         else:
-          when not defined(js):
-            doAssert x == 1.2345679'f32
-            doAssert $x == "1.2345679"
+          doAssert x == 1.2345679'f32
+          doAssert $x == "1.2345679"
 
 static: main()
 main()