[clang-tools-extra] [llvm] [llvm] add tool to verify mustache library (PR #111487)

[Nikita Popov via llvm-commits]

================
@@ -0,0 +1,104 @@
+//===- llvm-mustachespec.cpp - The LLVM Modular Optimizer
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Simple drivers to test the mustache spec found here
+// https://github.com/mustache/
+// It is used to verify that the current implementation conforms to the spec
+// simply download the spec and pass the test files to the driver
+//
+// Currently Triple Mustache is not supported we expect the following spec
+// test to fail:
+//    Triple Mustache
+//    Triple Mustache Integer Interpolation
+//    Triple Mustache Decimal Interpolation
+//    Triple Mustache Null Interpolation
+//    Triple Mustache Context Miss Interpolation
+//    Dotted Names - Triple Mustache Interpolation
+//    Implicit Iterators - Triple Mustache
+//    Triple Mustache - Surrounding Whitespace
+//    Triple Mustache - Standalone
+//    Triple Mustache With Padding
+//    Standalone Indentation
+//    Implicit Iterator - Triple mustache
----------------
nikic wrote:

I wonder whether it would make sense to include this list directly in the program, and report these as "xfail"? That way it's easy to see whether there are any unexpected failures without manually comparing to this list.

https://github.com/llvm/llvm-project/pull/111487