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There has been significant work on performance and toolchain improvement. See http://dave.cheney.net/2016/04/02/go-1-7-toolchain-improveme... for information.

Very incomplete: https://tip.golang.org/doc/go1.7.txt

This looks sweet:

runtime: support symbolic backtrace of C code in a cgo crash (CL 17761)

Now what does that mean? What does Fortran have to do with Go?

| add support for Fortran (CL 19670, CL 4114)

You can now call Fortran code through cgo, from Go.

the main changes are related to the SSA compiler backend and smaller binary files. 1.7 should also better support binary only packages (so vendors can sell compiled packages without providing sources, it kinda works right now but was hacky/buggy).