---

yaml
---
r: 349175
b: refs/heads/master-next
c: 881f521
h: refs/heads/master
i:
  349173: 990e4e9
  349171: 1638829
  349167: 0abb008

Author: xedin

[refs]

@@ -1,6 +1,6 @@
 ---
 refs/heads/master: 3574c513bbc5578dd9346b4ea9ab5995c5927bb5
-refs/heads/master-next: e30612e8cd257f9a49d200bfa3b7e26999a57286
+refs/heads/master-next: 881f521958be6f19e1d3ef505765f77840b026b4
 refs/tags/osx-passed: b6b74147ef8a386f532cf9357a1bde006e552c54
 refs/tags/swift-2.2-SNAPSHOT-2015-12-01-a: 6bb18e013c2284f2b45f5f84f2df2887dc0f7dea
 refs/tags/swift-2.2-SNAPSHOT-2015-12-01-b: 66d897bfcf64a82cb9a87f5e663d889189d06d07

branches/master-next/lib/Sema/CSDiagnostics.cpp

@@ -3508,6 +3508,20 @@ bool AllowTypeOrInstanceMemberFailure::diagnoseAsError() {
     return true;
   }
 
+  // Function type has fewer arguments than expected by context:
+  //
+  // ```
+  // func foo() {}
+  // let _: (Int) -> Void = foo
+  // ```
+  if (locator->isLastElement(ConstraintLocator::ContextualType)) {
+    auto &cs = getConstraintSystem();
+    emitDiagnostic(anchor->getLoc(), diag::cannot_convert_initializer_value,
+                   getType(anchor), resolveType(cs.getContextualType()));
+    // TODO: It would be great so somehow point out which arguments are missing.
+    return true;
+  }
+
   return false;
 }