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Created attachment 15759 [details]
Working and failing binary
The coreclr/tests/src/CoreMangLib/cti/system/text/unicodeencoding/unicodeencodinggetpreamble.cs in the acceptance-tests started failing in the following commit range: https://github.com/mono/mono/compare/9c9e9bf...e37b4bd
I suspect it is related to the Array.Empty optimization as the binary works fine if I compile it with a Mono 4.4 mcs and fails with a master mcs on a master runtime. I've attached the two binaries.
Fixed in master and 4.5