I prefer for it to be just a warning so I can debug without trouble, the build system will just prevent me from completing the pull request with it (and any other warning).
If it is a pure value, I’d assume yes, but if it is tied to a side effect (E.g. write its value to a file), then it would be not used but still could break your app if removed.
I’m not familiar with rust language specifically, but generally that’s what could happen
If only there was some way the compiler could detect unused variable declarations, and may be emit some sort of “warning”, which would be sort of like an “error”, but wouldn’t cause the build to fail, and could be treated as an error in CI pipelines
Let’s not pretend people acknowledge warnings, though. It’s a popular meme that projects will have hundreds of warnings and that devs will ignore them all.
There’s a perfectly valid use case for opinionated languages that don’t let you get away with that. It’s also similar to how go has gofmt to enforce a consistent formatting.
Honestly, I’ve been using Go for years and this unused variable error rarely comes up. When it does, it’s trivial to resolve. But the error has saved me from bugs more often than it has wasted my time. Most commonly when you declare a new variable in a narrower scope when you intended to assign to the variable of the same name (since Go has separate declare vs assign operators).
You can, if you want, opt into warnings causing your build to fail. This is commonly done in larger projects. If your merge request builds with warnings, it does not get merged.
In other words, it’s not a bad idea to want to flag unused variables and prevent them from ending up in source control. It’s a bad idea for the compiler to also pretend it’s a linter, and for this behaviour to be forced on, which ironically breaks the Unix philosophy principle of doing one thing and doing it well.
Mind you, this is an extremely minor pain point, but frankly this is like most Go design choices wherein the idea isn’t bad, but there exists a much better way to solve the problem.
As your future colleague wondering what the hell that variable is for, thanks Go.
I prefer for it to be just a warning so I can debug without trouble, the build system will just prevent me from completing the pull request with it (and any other warning).
Changing it will bring down the entire system.
We’ve spent ten million dollars and do not know why.
Isnt the syntax highlighting it as mever used?
So why would they wonder?
If it is a pure value, I’d assume yes, but if it is tied to a side effect (E.g. write its value to a file), then it would be not used but still could break your app if removed.
I’m not familiar with rust language specifically, but generally that’s what could happen
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Yeah that should be looked for in a CI line check, not a compilation requirement
You mean a system like the compiler
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Who needs an option to leave unused variables around the code base? Lazybones?
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Yeah any compiler should support environments or config files. Our CI would never work with without
--env “stage”If only there was some way the compiler could detect unused variable declarations, and may be emit some sort of “warning”, which would be sort of like an “error”, but wouldn’t cause the build to fail, and could be treated as an error in CI pipelines
Let’s not pretend people acknowledge warnings, though. It’s a popular meme that projects will have hundreds of warnings and that devs will ignore them all.
There’s a perfectly valid use case for opinionated languages that don’t let you get away with that. It’s also similar to how go has gofmt to enforce a consistent formatting.
Honestly, I’ve been using Go for years and this unused variable error rarely comes up. When it does, it’s trivial to resolve. But the error has saved me from bugs more often than it has wasted my time. Most commonly when you declare a new variable in a narrower scope when you intended to assign to the variable of the same name (since Go has separate declare vs assign operators).
You can, if you want, opt into warnings causing your build to fail. This is commonly done in larger projects. If your merge request builds with warnings, it does not get merged.
In other words, it’s not a bad idea to want to flag unused variables and prevent them from ending up in source control. It’s a bad idea for the compiler to also pretend it’s a linter, and for this behaviour to be forced on, which ironically breaks the Unix philosophy principle of doing one thing and doing it well.
Mind you, this is an extremely minor pain point, but frankly this is like most Go design choices wherein the idea isn’t bad, but there exists a much better way to solve the problem.
Some people simply ignore warnings, that’s the main issue. Trust me, I saw this way too often.
If you cannot compile it than you have to fix it, otherwise just mark unused variables as ‘not an error’ via
_ = someunusedvar.