enhanced compile_if_expression() not to eliminate blocks containing one or more labels

moo/kernel/Except.moo

@@ -250,7 +250,7 @@ extend MethodContext
 
 		if (self isExceptionContext) 
 		{
-			/* NOTE: the following loop scans all parameters to the on:do: method.
+			/* [NOTE] the following loop scans all parameters to the on:do: method.
 			 *       if the on:do: method contains local temporary variables,
 			 *       you must change this function to skip scanning local variables. 
 			 *       the current on:do: method has 1 local variable declared.

moo/kernel/generr.moo

@@ -109,8 +109,8 @@ class MyObject(Object)
 			'too many arguments'
 			'too many block temporaries'
 			'too many block arguments'
-			'too large block'
-			'too large array expression'
+			'array expression too large'
+			'instruction data too large'
 			'wrong primitive function number'
 			'wrong primitive function identifier'
 			'wrong primitive function argument definition'