Ugly error as there is no string formatter for AST

[jbeda]

$ ./jsonnet -e 'function(a, 1)'
STATIC ERROR: <cmdline>:1:13: Not an identifier: 0x7fbd51500350

It looks like, in parseParams, we are trying to output an AST object but there is no string formatter for ASTs. Perhaps unparse the AST there? Or try not to dump the text?

[sparkprime]

Doing what you did on the Go side is probably good enough: "Expected an identifier but got a complex expression"