prost | Protocol Buffers implementation for the Rust Language | Serialization library

I think this can be explained by a few observations/factors.

1. Most centuries (xxxx00 to xxxx99) have at least one prime.
2. The first century without a prime is 1671800.
3. The first millenium without a prime is 13893290219204000 (which is sufficiently greater than 10^9).

If you combine these factors, it's easy to see why most numbers can be made prime by changing two digits (since a large number of centuries have primes). And if the century doesn't have a prime, then changing three digits is guaranteed to give a solution, since each millenium in the given range has a prime number.

encode_to_vec is not a free function. You need to call it as one of

• f.encode_to_vec()
• foo::Foo::encode_to_vec(&f)
• Message::encode_to_vec(&f)
• ::encode_to_vec(&f)

The first method is the most normal, but the other ones may produce useful error messages when you get confused about what's going on.

[Edit:] Well, encode_to_vec was added in prost 0.8.0, so with 0.7.0, it won't be usable.

Editions are separately chosen by each crate being compiled. The current revision of the ed25519 crate requires a compiler that supports the 2021 edition. (You can find this out through docs.rs's handy source view: https://docs.rs/crate/ed25519/1.4.0/source/Cargo.toml.orig)

If you're trying to compile Rust binaries using a fixed compiler version (or an older version that might be in your distro package manager), then it's important to include a Cargo.lock file in your project/container configuration. The lock file specifies exact versions of each crate, so that your build cannot be broken by new library versions requiring newer compiler features.

However, there's a catch: cargo install ignores the lock file by default. So, you'll also need to change your command to pass the --locked flag to cargo install.

(You should also consider using a newer Rust compiler version, so that you don't have to use old versions of libraries that may have known bugs.)

prost doesn't have an option to turn that on so you have to do it yourself.

If you want to implement a trait for a type. You need to have either the trait or the type in your library/binary.

Since the trait is in std and the type is in an external crate the best you can do is create a unit struct to wrap the type. Then implement Debug for that.

It is really very difficult to help you with this information. The full error code would probably be useful.

Anyway, in "impl Node ... get_replyer()" you see that's callback should return somehink that's implement Copy

The function encode can't be used on trait objects since it uses generics.

You can make write_message generic instead:

It is not a good idea to compare hours with hours, minutes with minutes and second with seconds to find which HH:MM:SS combination is the fastest. There can be cases like 04:50:56 < 05:00:00, which does not evaluate well in your original compareTo() method.

Try this code instead:

The ** means any directory - including sub directories.

The * Means any file.

so src/**/* means any file in any directory inside the src directory.

The option is #[cfg(test)] (singular), not #[cfg(tests)] (plural). This is probably not failing because it's not being compiled or run at all, since the option is never set.