Native functions and a standard library

[ahdinosaur]

• add native function
• start stdlib: closes Start the Standard Library #17
  • length
  • map: close Stdlib: Map #49
  • range
• eval returns spanned values: close close Eval should return spanned values #42

[vercel]

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[ahdinosaur]

uh oh, to implement map, we need to evaluate the given function inside the map native function.

which means a native function needs to be able to return an EvalError

which means rimu-value depends on rimu-eval which depends on rimu-value

hmm...

---

possible solutions:

1. merge rimu-value into rimu-eval
2. create a new rimu-error crate, where errors live.
3. create a new EvalValue, where functions and things live. rimu-value is only data.

[ahdinosaur]

okay so,

• spanned values all the way

next steps:

• finish conversion of eval to spanned values
• current Value becomes SerdeValue.
• have conversions from Value to SerdeValue
  • Value -> SerdeValue: remove spans
• figure out what to do with tests, how to make empty spans for tests.
• how will env values work?
  • from_value uses SerdeValue
  • when evaluating an env (via an identifier), add span of identifier

[ahdinosaur]

okay, mostly works, some notes:

• not sure what should return what spans, wish we had Playground: Click on output item to highlight corresponding Rimu code #66
• if a function generates data, should return span of function
• if a function maps data, should return span of data being mapped?