Fix multiple requires in a test

lib/pure/unittest.nim

@@ -285,7 +285,7 @@ macro check*(conditions: stmt): stmt {.immediate.} =
 
     result = getAst(rewrite(checked, checked.lineinfo, checked.toStrLit))
 
-template require*(conditions: stmt): stmt {.immediate, dirty.} =
+template require*(conditions: stmt): stmt {.immediate.} =
   ## Same as `check` except any failed test causes the program to quit
   ## immediately. Any teardown statements are not executed and the failed
   ## test output is not generated.

tests/stdlib/tunittest.nim

@@ -21,6 +21,11 @@ test "unittest typedescs":
   check(none(int) != some(1))
 
 
+test "unittest multiple requires":
+  require(true)
+  require(true)
+
+
 import math
 from strutils import parseInt
 proc defectiveRobot() =