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update readme

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Niko Matsakis 2018-10-18 21:26:54 -04:00
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7
examples/hello_world/README.md
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@ -51,8 +51,11 @@ database).
Within this trait, we list out the queries that this group provides.
Here, there are two: `input_string` and `length`. For each query, you
specify the key and value type of the query in the form of a function:
but the "fn body" is obviously not real Rust syntax. Rather, it's just
specify a function signature: the parameters to the function are
called the "key types" (in this case, we just give a single key of
type `()`) and the return type is the "value type". You can have any
number of key types. As you can see, though, this is not a real fn --
the "fn body" is obviously not real Rust syntax. Rather, it's just
used to specify a few bits of metadata about the query. We'll see how
to define the fn body in the next step.