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Two are known to me:
1) PR 9972 has been concluded to be impossible to fix so long as some front ends use both inliners.
2) The RTL inliner is a major obstacle to making all RTL be transiently allocated, and therefore to removing RTL from the purview of the garbage collector. Daniel Berlin has numbers indicating that allocation of RTL from the GC heap causes huge amounts of memory to be wasted, with consequent compile-time performance hit.
zw
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