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-rw-r--r--lib/pure/rationals.nim1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/pure/rationals.nim b/lib/pure/rationals.nim
index 60d09c71a..79dc6de16 100644
--- a/lib/pure/rationals.nim
+++ b/lib/pure/rationals.nim
@@ -20,6 +20,7 @@ type Rational*[T] = object
 
 proc initRational*[T](num, den: T): Rational[T] =
   ## Create a new rational number.
+  assert(den != 0, "a denominator of zero value is invalid")
   result.num = num
   result.den = den