rust/tests/ui/compiletest-self-test/compile-flags-last.rs

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// Check that the arguments provided through `// compile-flags` are added last to the command line
// in UI tests. To ensure that we invoke rustc with a flag that expects an argument withut actually
// providing it. If the compile-flags are not last, the test will fail as rustc will interpret the
// next flag as the argument of this flag.
//
//@ compile-flags: --cap-lints
//@ error-pattern: Argument to option 'cap-lints' missing