92 lines
2.3 KiB
Rust
92 lines
2.3 KiB
Rust
#![warn(clippy::drop_ref, clippy::forget_ref)]
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#![allow(clippy::toplevel_ref_arg, clippy::similar_names, clippy::needless_pass_by_value)]
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use std::mem::{drop, forget};
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struct SomeStruct;
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fn main() {
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drop(&SomeStruct);
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forget(&SomeStruct);
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let mut owned1 = SomeStruct;
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drop(&owned1);
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drop(&&owned1);
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drop(&mut owned1);
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drop(owned1); //OK
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let mut owned2 = SomeStruct;
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forget(&owned2);
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forget(&&owned2);
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forget(&mut owned2);
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forget(owned2); //OK
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let reference1 = &SomeStruct;
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drop(reference1);
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forget(&*reference1);
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let reference2 = &mut SomeStruct;
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drop(reference2);
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let reference3 = &mut SomeStruct;
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forget(reference3);
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let ref reference4 = SomeStruct;
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drop(reference4);
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forget(reference4);
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}
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#[allow(dead_code)]
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fn test_generic_fn_drop<T>(val: T) {
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drop(&val);
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drop(val); //OK
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}
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#[allow(dead_code)]
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fn test_generic_fn_forget<T>(val: T) {
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forget(&val);
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forget(val); //OK
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}
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#[allow(dead_code)]
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fn test_similarly_named_function() {
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fn drop<T>(_val: T) {}
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drop(&SomeStruct); //OK; call to unrelated function which happens to have the same name
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std::mem::drop(&SomeStruct);
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fn forget<T>(_val: T) {}
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forget(&SomeStruct); //OK; call to unrelated function which happens to have the same name
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std::mem::forget(&SomeStruct);
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}
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#[derive(Copy, Clone)]
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pub struct Error;
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fn produce_half_owl_error() -> Result<(), Error> {
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Ok(())
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}
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fn produce_half_owl_ok() -> Result<bool, ()> {
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Ok(true)
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}
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#[allow(dead_code)]
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fn test_owl_result() -> Result<(), ()> {
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produce_half_owl_error().map_err(|_| ())?;
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produce_half_owl_ok().map(|_| ())?;
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// the following should not be linted,
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// we should not force users to use toilet closures
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// to produce owl results when drop is more convenient
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produce_half_owl_error().map_err(drop)?;
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produce_half_owl_ok().map_err(drop)?;
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Ok(())
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}
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#[allow(dead_code)]
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fn test_owl_result_2() -> Result<u8, ()> {
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produce_half_owl_error().map_err(|_| ())?;
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produce_half_owl_ok().map(|_| ())?;
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// the following should not be linted,
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// we should not force users to use toilet closures
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// to produce owl results when drop is more convenient
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produce_half_owl_error().map_err(drop)?;
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produce_half_owl_ok().map(drop)?;
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Ok(1)
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}
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