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Adds `expect_leak_or_bad_free :: proc(t: ^T, client_test: proc(t: ^T), verifier: Memory_Verifier_Proc)`. It sets up its own `Tracking_Allocator`, runs the `client_test`, and then calls the `verifier` procedure. The verifier can then inspect the contents of the tracking allocator and call `testing.expect*` as sensible for the test in question. Any allocations are then cleared so that the test runner doesn't itself complain about leaks. Additionally, `ODIN_TEST_LOG_LEVEL_MEMORY` has been added as a define to set the severity of the test runner's memory tracker. You can use `-define:ODIN_TEST_LOG_LEVEL_MEMORY=error` to make tests fail rather than warn if leaks or bad frees have been found.