Since it is impossible to detect stack overflow of C functions robustly, the test is a bit unreasonable. https://rubyci.org/logs/rubyci.s3.amazonaws.com/debian-riscv64/ruby-master/log/20200421T120018Z.fail.html.gz
encoding:
Proc
Hash#to_proc
debug_level:
RubyVM::InstructionSequence.compile