Testing That Code Does Not Compile The Rust Programming Language Forum

Testing That Code Does Not Compile The Rust Programming Language Forum One advantage of using a strongly typed language like rust is that some programmer errors are immediately detected at compile time and lead to a compilation failure. How can i ensure that the test function continues to fail to compile from rust's test framework?.

The Rust Programming Language Forum Discover Discourse Discover These are the tests for code samples in our book that are there to illustrate errors. the tests check that rustc agrees they are erroneous. they also help us notice when a new rustc version has different error messages, so we can update the book. A global concern must be addressed globally. even if you're the final binary artifact crate, the only way to test that std or alloc aren't used is to compile for a target without the stdroot crate in question (much to the annoyance of no std libraries that want to ensure they're std free.). Even if you had a separate crate where you isolate your must not compile tests, it would be very difficult to ensure that all the test functions fail to compile, not just one of them. Hey everyone, i was wondering if it's possible to write a "compile fail test", i.e. a small #[test] that should fail to compile.

Can T Compile In Rust The Rust Programming Language Forum Even if you had a separate crate where you isolate your must not compile tests, it would be very difficult to ensure that all the test functions fail to compile, not just one of them. Hey everyone, i was wondering if it's possible to write a "compile fail test", i.e. a small #[test] that should fail to compile. Testing the exact form of an error is fundamentally fragile, though. the compiler is constantly tweaking and improving diagnostics, so if you're testing what the error message is, updates to the compiler may require re "blessing" your tests. I have a function and a test for it. i want the function to return additional information to be printed in case the test fails. collecting this information is performance heavy and i want it only for this particular test…. Procedural macros use their own parser like syn, and not rust's built in parser. it's possible that syn or tokio's implementation doesn't understand this syntax. See the adding new tests and best practices chapters for a tutorial on creating a new test and advice on writing a good test, and the running tests chapter on how to run the test suite.

Can T Compile In Rust The Rust Programming Language Forum Testing the exact form of an error is fundamentally fragile, though. the compiler is constantly tweaking and improving diagnostics, so if you're testing what the error message is, updates to the compiler may require re "blessing" your tests. I have a function and a test for it. i want the function to return additional information to be printed in case the test fails. collecting this information is performance heavy and i want it only for this particular test…. Procedural macros use their own parser like syn, and not rust's built in parser. it's possible that syn or tokio's implementation doesn't understand this syntax. See the adding new tests and best practices chapters for a tutorial on creating a new test and advice on writing a good test, and the running tests chapter on how to run the test suite.