Ergonomic, hermetic, user-friendly software build system for Python, Go, Java, Kotlin, Protobuf, Scala, Shell. Pants lets you fearlessly scale up your codebase!

Pants

so the split borrow here is field by field

the example they give of a binary tree is interesting

you can mutably borrow both the left and right side of a binary tree at the same time, because they're different struct fields.

got it. makes sense to do that, wasnt aware that you could.

the mutable slices in a binary tree was a good ready anyhow - thanks for referencing

what’s up with matching on `&amp;None`?

little confused by context.externs.clone_val(value). there must be a reason to not just wrapping reference to value

<@U0AR45336> : if we returned a reference, we would continue to borrow the context mutably

the borrow checker says: "this reference points into the graph, so you're still borrowing it"

<@U0AR45336> : good comment though. thinking about that more, it seems like i should be able to downgrade the borrow

ah ok, makes sense - to both the comments

```&gt;&gt;&gt; six.text_type(b'中文')
Traceback (most recent call last):
  File "&lt;console&gt;", line 1, in &lt;module&gt;
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe4 in position 0: ordinal not in range(128)
&gt;&gt;&gt; six.text_type
&lt;type 'unicode'&gt;```

```&gt;&gt;&gt; b'中文'
'\xe4\xb8\xad\xe6\x96\x87'```

...ah, i need to `decode('utf-8')` maybe?

<@U066LC126> : a trick while iterating on the rust code: `MODE=debug` will compile in debug mode, which is faster (to compile)

i just iterate on ```MODE=debug time ./pants --enable-v2-engine help &gt; /dev/null``` until it's building

it probably ought to be the default when bootstrapping in the repo

ultimately it’s a tradeoff of compilation speed vs runtime speed - was thinking it made sense to bias to ppl running pants vs developers who could easily set the env var

was at least a surprise to me that it got 2x+ slower in debug mode vs release mode

but I suppose more and more ppl use versioned releases these days, so perhaps was the wrong call