rust/src/test/run-pass/if-check.rs

fn even(x: usize) -> bool {
    if x < 2 {
        return false;
    } else if x == 2 { return true; } else { return even(x - 2); }
}

fn foo(x: usize) {
    if even(x) {
        println!("{}", x);
    } else {
        panic!();
    }
}

pub fn main() { foo(2); }
Mass rename uint/int to usize/isize Now that support has been removed, all lingering use cases are renamed. 2015-03-25 19:06:52 -05:00			`fn even(x: usize) -> bool {`
Remove integer suffixes where the types in compiled code are identical. 2015-03-03 02:42:26 -06:00			`if x < 2 {`
Convert ret to return 2012-08-01 19:30:05 -05:00			`return false;`
Remove integer suffixes where the types in compiled code are identical. 2015-03-03 02:42:26 -06:00			`} else if x == 2 { return true; } else { return even(x - 2); }`
Bring back if-check Add "if check" (expr_if_check), a variation on check that executes an "else" clause rather than failing if the check doesn't hold. 2011-06-16 13:56:34 -05:00			`}`

Mass rename uint/int to usize/isize Now that support has been removed, all lingering use cases are renamed. 2015-03-25 19:06:52 -05:00			`fn foo(x: usize) {`
remove typestate from code, tests, and docs 2012-07-13 20:43:52 -05:00			`if even(x) {`
log: Introduce liblog, the old std::logging This commit moves all logging out of the standard library into an external crate. This crate is the new crate which is responsible for all logging macros and logging implementation. A few reasons for this change are: * The crate map has always been a bit of a code smell among rust programs. It has difficulty being loaded on almost all platforms, and it's used almost exclusively for logging and only logging. Removing the crate map is one of the end goals of this movement. * The compiler has a fair bit of special support for logging. It has the __log_level() expression as well as generating a global word per module specifying the log level. This is unfairly favoring the built-in logging system, and is much better done purely in libraries instead of the compiler itself. * Initialization of logging is much easier to do if there is no reliance on a magical crate map being available to set module log levels. * If the logging library can be written outside of the standard library, there's no reason that it shouldn't be. It's likely that we're not going to build the highest quality logging library of all time, so third-party libraries should be able to provide just as high-quality logging systems as the default one provided in the rust distribution. With a migration such as this, the change does not come for free. There are some subtle changes in the behavior of liblog vs the previous logging macros: * The core change of this migration is that there is no longer a physical log-level per module. This concept is still emulated (it is quite useful), but there is now only a global log level, not a local one. This global log level is a reflection of the maximum of all log levels specified. The previously generated logging code looked like: if specified_level <= __module_log_level() { println!(...) } The newly generated code looks like: if specified_level <= ::log::LOG_LEVEL { if ::log::module_enabled(module_path!()) { println!(...) } } Notably, the first layer of checking is still intended to be "super fast" in that it's just a load of a global word and a compare. The second layer of checking is executed to determine if the current module does indeed have logging turned on. This means that if any module has a debug log level turned on, all modules with debug log levels get a little bit slower (they all do more expensive dynamic checks to determine if they're turned on or not). Semantically, this migration brings no change in this respect, but runtime-wise, this will have a perf impact on some code. * A `RUST_LOG=::help` directive will no longer print out a list of all modules that can be logged. This is because the crate map will no longer specify the log levels of all modules, so the list of modules is not known. Additionally, warnings can no longer be provided if a malformed logging directive was supplied. The new "hello world" for logging looks like: #[phase(syntax, link)] extern crate log; fn main() { debug!("Hello, world!"); } 2014-03-09 00:11:44 -06:00			`println!("{}", x);`
Register snapshots and switch logging over to use of log_full or #error / #debug. 2011-12-22 16:42:52 -06:00			`} else {`
Rename fail! to panic! https://github.com/rust-lang/rfcs/pull/221 The current terminology of "task failure" often causes problems when writing or speaking about code. You often want to talk about the possibility of an operation that returns a Result "failing", but cannot because of the ambiguity with task failure. Instead, you have to speak of "the failing case" or "when the operation does not succeed" or other circumlocutions. Likewise, we use a "Failure" header in rustdoc to describe when operations may fail the task, but it would often be helpful to separate out a section describing the "Err-producing" case. We have been steadily moving away from task failure and toward Result as an error-handling mechanism, so we should optimize our terminology accordingly: Result-producing functions should be easy to describe. To update your code, rename any call to `fail!` to `panic!` instead. Assuming you have not created your own macro named `panic!`, this will work on UNIX based systems: grep -lZR 'fail!' . \| xargs -0 -l sed -i -e 's/fail!/panic!/g' You can of course also do this by hand. [breaking-change] 2014-10-09 14:17:22 -05:00			`panic!();`
Register snapshots and switch logging over to use of log_full or #error / #debug. 2011-12-22 16:42:52 -06:00			`}`
			`}`
if-check test case 2011-06-15 18:23:17 -05:00
Remove integer suffixes where the types in compiled code are identical. 2015-03-03 02:42:26 -06:00			`pub fn main() { foo(2); }`