 1> let a: () -> Int = { 42 } a: () -> Int = 0x00000001000c5030 $__lldb_expr8`closure #1 () -> Swift.Int in __lldb_expr_7 at repl.swift:1 2> let b = a b: () -> Int = 0x00000001000c5030 $__lldb_expr8`closure #1 () -> Swift.Int in __lldb_expr_7 at repl.swift:1 3> a === b error: repl.swift:3:3: error: cannot check reference equality of functions; operands here have types '() -> Int' and '() -> Int' a === b ~ ^ ~