Add a testcase for a fixed issue, remove a fixme that has been fixed. NFC.

Author: lattner

test/Generics/unbound.swift

@@ -94,3 +94,15 @@ class SomeClassWithInvalidMethod {
   }
 }
 
+// <rdar://problem/20792596> QoI: Cannot invoke with argument list (T), expected an argument list of (T)
+protocol r20792596P {}
+
+// expected-note @+1 {{in call to function 'foor20792596'}}
+func foor20792596<T: r20792596P>(x: T) -> T {
+  return x
+}
+
+func callfoor20792596<T>(x: T) -> T {
+  return foor20792596(x) // expected-error {{generic parameter 'T' could not be inferred}}
+}
+

test/expr/expressions.swift

@@ -51,7 +51,6 @@ func basictest() {
   // expected-note @-1 {{overloads for '+' exist with these partially matching parameter lists:}}
 
 
-  // FIXME rdar://22333090 - Improve diagnostic.
   var x9 : Int16 = x8 + 1 // expected-error{{cannot convert value of type 'Int8' to expected argument type 'Int16'}}
 
   // Various tuple types.