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It would be nice if the README mentioned it was originally based on my https://github.com/quartzjer/js0n :)

Added your project as a reference. Sorry for the missing reference I originally never planned to make the project known publicly and therefore never added the references.

This is absolutely beautiful. I didn't know you could get an address of a label in C or to do a goto to an address from variable instead of a literal label. Is this new in C, or was it always there?

It's a GCC extension. https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html

Is there an equivalent for Clang/LLVM?

Yes.

http://blog.llvm.org/2010/01/address-of-label-and-indirect-b...

A venerable interpreter implementation trick.

Unfortunately it won't port to IAR, which is a shame. I don't understand why pointers to labels never made it to the C spec; it's one of the (equivaling) features that actually makes assembler look elegant.

That test.c file looks familiar!

Yeah I was looking for unit test macros and found your project. I added your project as a reference in the README for clarification of the origin.

That's a very nice code.