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Fix build failures when cmake never used
FISH_BUILD_DIR (nominally, ./build) is created by cmake. If you only check out the project via git and then run `cargo build`, this directory won't exist and many of the tests will fail.
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@ -65,6 +65,9 @@ pub mod prelude {
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pub fn test_init() -> impl ScopeGuarding<Target = ()> {
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static DONE: OnceCell<()> = OnceCell::new();
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DONE.get_or_init(|| {
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// If we are building with `cargo build` and have build w/ `cmake`, FISH_BUILD_DIR might
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// not yet exist.
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std::fs::create_dir_all(env!("FISH_BUILD_DIR")).unwrap();
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set_current_dir(env!("FISH_BUILD_DIR")).unwrap();
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{
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let s = CString::new("").unwrap();
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