[llvm-bugs] [Bug 42915] New: ICE on lambdas returning lambdas 3 deep, when using move or fwd ref

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42915

            Bug ID: 42915
           Summary: ICE on lambdas returning lambdas 3 deep, when using
                    move or fwd ref
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvmbugbjorn at fahller.se
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Created attachment 22349
  --> https://bugs.llvm.org/attachment.cgi?id=22349&action=edit
Example code causing ICE

The attached file crashes clang++-8.0.0, and trunk (367966).

The crashes are on the lines with a comment '// E'. If those lines are
commented out, it compiles.

There are two ways to make it compile. Remove '= std::move(function)' under the
comment '// 1' or remove the forwarding reference '&&' under the comment '// 2'

godbolt link: https://gcc.godbolt.org/z/DXqN06

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