[Macros] Add more tests for macro arguments.

Author: hborla

test/Macros/attached_macros_diags.swift

@@ -7,10 +7,19 @@
 @attached(accessor) macro m2(_: Int) -> Void = #externalMacro(module: "MyMacros", type: "Macro2")
 // expected-warning@-1{{external macro implementation type 'MyMacros.Macro2' could not be found for macro 'm2'}}
 // expected-note@-2{{candidate has partially matching parameter list (Int)}}
+// expected-note@-3{{candidate expects value of type 'Int' for parameter #1 (got 'String')}}
 
 @attached(accessor) macro m2(_: Double) -> Void = #externalMacro(module: "MyMacros", type: "Macro2")
 // expected-warning@-1{{external macro implementation type 'MyMacros.Macro2' could not be found for macro 'm2'}}
 // expected-note@-2{{candidate has partially matching parameter list (Double)}}
+// expected-note@-3{{candidate expects value of type 'Double' for parameter #1 (got 'String')}}
+
+@attached(accessor) macro m3(message: String) -> Void = #externalMacro(module: "MyMacros", type: "Macro3")
+// expected-warning@-1{{external macro implementation type 'MyMacros.Macro3' could not be found for macro 'm3(message:)'}}
+
+@expression macro stringify<T>(_ value: T) -> (T, String) = #externalMacro(module: "MyMacros", type: "StringifyMacro")
+// expected-warning@-1{{external macro implementation type 'MyMacros.StringifyMacro' could not be found for macro 'stringify'}}
+// expected-note@-2{{'stringify' declared here}}
 
 @m1 struct X1 { }
 
@@ -29,3 +38,29 @@ struct SkipNestedType {
   @m1 var x: Int = 0
   // expected-error@-1{{external macro implementation type 'MyMacros.Macro1' could not be found for macro 'm1()'; the type must be public and provided via '-load-plugin-library'}}
 }
+
+struct TestMacroArgs {
+  @m1("extra arg") struct Args1 {} // expected-error{{argument passed to call that takes no arguments}}
+
+  @m2(10) struct Args2 {}
+
+  @m2(10.0) struct Args3 {}
+
+  @m2("") struct Args4 {} // expected-error{{no exact matches in call to macro 'm2'}}
+
+  @m2(Nested.x) struct Args5 {}
+
+  struct Nested {
+    static let x = 10
+
+    @m2(x) struct Args1 {}
+
+    @m2(Nested.x) struct Args2 {}
+  }
+
+  @m3(message: stringify(Nested.x).1) struct Args6 {}
+  // expected-error@-1{{expansion of macro 'stringify' requires leading '#'}}
+
+  @m3(message: #stringify(Nested.x).1) struct Args7 {}
+  // expected-error@-1{{external macro implementation type 'MyMacros.StringifyMacro' could not be found for macro 'stringify'}}
+}