Merge pull request #1 from milseman/stdlib-string-no-inlinable

[test] Update diagnostic test for SR-7599

test/Constraints/diagnostics.swift

@@ -161,7 +161,8 @@ func rdar20142523() {
 // <rdar://problem/21080030> Bad diagnostic for invalid method call in boolean expression: (_, ExpressibleByIntegerLiteral)' is not convertible to 'ExpressibleByIntegerLiteral
 func rdar21080030() {
   var s = "Hello"
-  if s.count() == 0 {} // expected-error{{cannot call value of non-function type 'Int'}}{{13-15=}}
+  // SR-7599: This should be `cannot_call_non_function_value`
+  if s.count() == 0 {} // expected-error{{cannot invoke 'count' with no arguments}}
 }
 
 // <rdar://problem/21248136> QoI: problem with return type inference mis-diagnosed as invalid arguments