gistfile1.txt

Welcome to Swift!  Type :help for assistance.
  1> func derp(a,b,c) { return a + b + c }
<REPL>:1:11: error: use of undeclared type 'a'
func derp(a,b,c) { return a + b + c }
          ^
<REPL>:1:13: error: use of undeclared type 'b'
func derp(a,b,c) { return a + b + c }
            ^
<REPL>:1:15: error: use of undeclared type 'c'
func derp(a,b,c) { return a + b + c }
              ^

  1> func derp(a:Int,b:Int,c:Int) { return a + b + c }
<REPL>:1:45: error: could not find an overload for '+' that accepts the supplied arguments
func derp(a:Int,b:Int,c:Int) { return a + b + c }
                                      ~~~~~~^~~

  1> func derp(a:Int,b:Int,c:Int) -> Int { return a + b + c }
  2>