Macros
Source: https://github.com/seanmonstar/warp/issues/619
Takes a list of handler expressions and
ors them together
in a balanced tree. That is, instead of a.or(b).or(c).or(d),
it produces (a.or(b)).or(c.or(d)), thus nesting the types
less deeply, which provides improvements in compile time.Construct a
serde_json::Value from a JSON literal.