patterns `&Unspecified` and `&__Nonexhaustive` not covered [closed] - rust

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I'm getting this on a match block:
patterns `&Unspecified` and `&__Nonexhaustive` not covered
The code:
fn vipaddress_from_ipddress(address: &IpAddress) -> VIpAddress {
match address {
I think &Unspecified has something to do with not accounting for null case, but references in Rust cannot be null. What is &__Nonexhaustive?

Seems to be an undocumented enum variant: https://docs.rs/ethox/0.0.1-wip/src/ethox/wire/ip.rs.html#15
This possibly indicates that the developer does not expect the users of IpAddress to match; maybe there is already a function doing what you want?

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How to use Ruplacer in another function (Rust) [closed]

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I've tried to write a function to replace string in a directory. And I founded a performance library written in Rust. https://github.com/TankerHQ/ruplacer, but the documentations only works in CLI. Now I can not custom the library to a function like that:
fn replace(path, foo, bar) {
ruplacer(path, foo, bar)
}

Variable naming convension for whether having [closed]

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Variable for whether having, for example, the variable for if the user has points, which is correct?
have_points, has_points, if_having_points or if_has_points?
Naming convention for a variable which holds boolean value should be indicated by prefixes like: is, has, have, does, will, can etc.
In your case you're using snake case. If "has Points" is being tracked for a single entity then you can go with has_points. For more than one entity you might want to go for have_points.
Although it boils to personal preference, but you should still try to keep your code short and succinct.

How to change specific part of a string? [closed]

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For example, I have a string like this
a = "starlight sunlight"
And I want to change it into
a = "starspot sunspot"
well i guessed you writing this in python so you can use the replace method
enter example
in your case you went to replace the word light with the word spot so just write
a=a.replace("light","post")

incorrect format in string.Format [closed]

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I have the following code
string x = string.Format(text, args);
the text is a string and the args is a in array object[0]
I'm getting the exception
Input string was not in a correct format.
any help ?
Assuming this is c#, you need a number, starting with 0, in the {}.

Simplest way to handle non-determinism in Haskell? [closed]

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The search algorithm I'm implementing (a simple partial order planner) just has a few choices to make at each invocation. Ideally I would like it to backtrack over the possibilities and return the first found solution.
Take a look at the list ([]) monad instance. It's commonly used for non-determinism.

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