From ea5a31d18f8cc8bc1318579768de5033bd7297cd Mon Sep 17 00:00:00 2001
From: Holly Borla <hborla@apple.com>
Date: Mon, 29 Jun 2020 15:14:46 -0700
Subject: [PATCH] [NFC] Add a test for constraint generation failures in a
 pattern binding decl inside of a function builder.

---
 test/Constraints/function_builder_diags.swift | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/Constraints/function_builder_diags.swift b/test/Constraints/function_builder_diags.swift
index 1a04e05892926..359fa6bdad05d 100644
--- a/test/Constraints/function_builder_diags.swift
+++ b/test/Constraints/function_builder_diags.swift
@@ -418,11 +418,14 @@ func testNonExhaustiveSwitch(e: E) {
 // rdar://problem/59856491
 struct TestConstraintGenerationErrors {
   @TupleBuilder var buildTupleFnBody: String {
+    let a = nil // expected-error {{'nil' requires a contextual type}}
     String(nothing) // expected-error {{cannot find 'nothing' in scope}}
   }
 
   func buildTupleClosure() {
-    tuplify(true) { _ in
+    // FIXME: suppress the ambiguity error
+    tuplify(true) { _ in // expected-error {{type of expression is ambiguous without more context}}
+      let a = nothing // expected-error {{cannot find 'nothing' in scope}}
       String(nothing) // expected-error {{cannot find 'nothing' in scope}}
     }
   }