This is an ephemeral object that implements the core::fmt::Write trait.
It’s used as write!(&zx_libc::sanitizer::Log::new(), "...", ...) to send
a single logging line. The object holds a fixed buffer that is used to
collect the multiple fragments from formatters; it’s written using
zx_libc::sanitizer::log() when the buffer fills or the object is dropped.
Write logging information from the sanitizer runtime. The string is
expected to be printable text with ‘\n’ ending each line. Timestamps and
globally unique identifiers of the calling process and thread (zx::Koid)
are attached to all messages, so there is no need to include those details
in the text. The log of messages written with this call automatically
includes address and ELF build ID details of the program and all shared
libraries sufficient to translate raw address values into program symbols
or source locations via a post-processor that has access to the original
ELF files and their debugging information. The text can contain markup
around address values that should be resolved symbolically.