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-rw-r--r--tests/float/tfloat4.nim10
1 files changed, 8 insertions, 2 deletions
diff --git a/tests/float/tfloat4.nim b/tests/float/tfloat4.nim
index f6216c374..2bb61eb58 100644
--- a/tests/float/tfloat4.nim
+++ b/tests/float/tfloat4.nim
@@ -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.")