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This is a library for managing targets for compilers and related tools.

Currently, the main feature is support for decoding "triples", which
are strings that identify a particular target configuration. They're named
"triples" because historically they contained three fields, though over time
they've added additional fields. This library provides a `Triple` struct
containing enums for each of fields of a triple. `Triple` implements
containing enums for each of fields of a triple. `Triple` implements
`FromStr` and `fmt::Display` so it can be converted to and from the
conventional string representation of a triple.

`Triple` also has functions for querying a triple's endianness,
pointer bit width, and binary format.
pointer bit width, and binary format.

And, `Triple` and the enum types have `host()` constructors, for targeting
the host.

It supports all triples currently used by rustc and rustup.
It supports all triples currently used by rustc and rustup.

It does not support reading JSON target files itself. To use it with a JSON
target file, construct a `Triple` using the value of the "llvm-target" field.