\r
[ B{ 123 } ] [ 123 0 B{ 0 } [ set-nth ] keep ] unit-test\r
\r
-[ B{ 123 } ] [ 123 >bignum 0 B{ 0 } [ set-nth ] keep ] unit-test
\ No newline at end of file
+[ B{ 123 } ] [ 123 >bignum 0 B{ 0 } [ set-nth ] keep ] unit-test\r
+\r
+[ 1.5 B{ 1 2 3 } nth-unsafe ] must-fail\r
+[ 0 1.5 B{ 1 2 3 } set-nth-unsafe ] must-fail\r
[ fixnum ] [ 1 >bignum SBUF" " new-sequence length class-of ] unit-test
[ fixnum ] [ 1 >bignum iota [ ] SBUF" " map-as length class-of ] unit-test
+
+[ 1.5 SBUF" " new-sequence ] must-fail
+
+[ CHAR: A 0.5 0.5 SBUF" a" set-nth-unsafe ] must-fail