a2dc2b6549
On OSX, Lean was often crashing when using trace messages. I identified a problem in the thread finalization process. In OSX, the `silent_ios_helper` at `library/trace.cpp` was being finalized after the `null_streambuf` at `util/null_ostream.cpp`. There was also a memory corruption problem also related to `null_streambuf`. This commit fixes this problem by using the following recipe for creating null output stream buffers in C++. https://stackoverflow.com/questions/11826554/standard-no-op-output-stream
8 lines
204 B
Text
8 lines
204 B
Text
constant f : nat → nat → nat
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constant fax1 : ∀ x, f x x = f x 0
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constant fax2 : ∀ x, f x 0 = x
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set_option trace.type_context.is_def_eq true
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example (a : nat) : f a a = a :=
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by simp [fax1, fax2]
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