@@ -9,9 +9,9 @@
 import core.exception;
 
 /// Unittest helper that asserts an expression must throw something
 
-void assert_throw(ExceptionType, T, string fn=__FILE__, int ln=__LINE__)(lazy T t, string msg="")
+void assert_throw(ExceptionType, T, string fn=__FILE__, size_t ln=__LINE__)(lazy T t, string msg="")
 {
 	try
 		{ t(); }
 	catch(ExceptionType)
@@ -22,9 +22,9 @@
 }
 
 /// Unittest helper that asserts an expression must not throw anything
 
-auto assert_nothrow(T, string fn=__FILE__, int ln=__LINE__)(lazy T t, string msg="")
+auto assert_nothrow(T, string fn=__FILE__, size_t ln=__LINE__)(lazy T t, string msg="")
 {
 	try
 		{ return t(); }
 	catch(Throwable e)
@@ -51,9 +51,9 @@
 /// Unittest helpers asserting two values are in some relation ==, !=, <, <=, >, >=
 
 template assertOp(string op)
 {
-	void assertOp(A, B, string fn=__FILE__, int ln=__LINE__)(A a, B b, string msg="")
+	void assertOp(A, B, string fn=__FILE__, size_t ln=__LINE__)(A a, B b, string msg="")
 	{
 		try
 			{ if( mixin("a"~op~"b") ) return; }
 		catch(Throwable e)