tree 5ffcb85f78ccdcb04080c7d30ab5835878940f0e
parent 76ceebb0d96361de2b61bf8e504d306d1f2e492f
author Eric Fiselier <eric@efcs.ca> 1586468380 -0400
committer Tom Stellard <tstellar@redhat.com> 1593204372 -0700

[libc++] Fix recursive instantiation in std::array.

The use of the `&& ...` fold expression in std::array's deduction guides
recursively builds a set of binary operator expressions of depth N where
`N` is the number of elements in the initializer.

This is problematic because arrays may be large, and instantiation
depth is limited.

This patch addresses the issue by flattening the SFINAE using
the existing `__all` type trait.

(cherry picked from commit c6eb584c64872fbb779df14acd31c1f3947f6e52)