Prevent changing meaning of std in desugared expressions about go-jsonnet HOT 4 OPEN

This is also a bug in the C++ version I think?

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Short answer is "yes":

$ jsonnet -e '1 == 1'
true

$ jsonnet -e 'local std2 = std; local std = std2 { primitiveEquals(a, b):: false }; 1 == 1'
false

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shouldn't std be just a reserved keyword which can not be used to create a local?

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In jrsonnet, I have fixed this by not desugaring and instead implementing the comparison/mod (formatting) operator directly.
https://github.com/CertainLach/jrsonnet/blob/master/crates/jrsonnet-evaluator/src/evaluate/operator.rs#L141

In sjsonnet they have implemented the same approach.
https://github.com/databricks/sjsonnet/blob/master/sjsonnet/src/sjsonnet/Evaluator.scala#L363

(This caused some problems: in jrsonnet, stdlib is not special, but the separate library, same as any user can write when using jrsonnet as a library, so formatting/comparison are implemented in core language, and not in the stdlib. I don't think this applies to cpp-jsonnet/go-jsonnet, though.)
https://github.com/CertainLach/jrsonnet/blob/master/crates/jrsonnet-stdlib/src/lib.rs

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