Add note that LEAVE phasers do get run

even when routine param binding fails

Author: zoffixznet

doc/Language/phasers.pod6

@@ -272,6 +272,21 @@ that point.
         42 # this is the return value
     }
 
+B<Note:> be mindful of C<LEAVE> phasers directly in blocks of routines, as
+they will get executed even when an attempt to call the routine with wrong
+arguments is made:
+
+    sub foo (Int) {
+        say "Hello!";
+        LEAVE say "oh noes!"
+    }
+    try foo rand; # OUTPUT: «oh noes!␤»
+
+Although the subroutine's body did not get run, because the sub expects
+an L<Int> and L«C<rand>|/routine/rand» returned a L<Num>, its block was
+entered and left (when param binding failed), and so the C<LEAVE> phaser
+I<was> run.
+
 =head2 X<KEEP|Phasers>
 
 Runs at every successful block exit, as part of the LEAVE queue (shares the