135 lines
3.1 KiB
Rust
135 lines
3.1 KiB
Rust
// run-rustfix
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#![allow(unused)]
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#![warn(clippy::seek_to_start_instead_of_rewind)]
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use std::fs::OpenOptions;
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use std::io::{Read, Seek, SeekFrom, Write};
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struct StructWithSeekMethod {}
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impl StructWithSeekMethod {
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fn seek(&mut self, from: SeekFrom) {}
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}
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trait MySeekTrait {
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fn seek(&mut self, from: SeekFrom) {}
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}
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struct StructWithSeekTrait {}
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impl MySeekTrait for StructWithSeekTrait {}
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// This should NOT trigger clippy warning because
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// StructWithSeekMethod does not implement std::io::Seek;
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fn seek_to_start_false_method(t: &mut StructWithSeekMethod) {
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t.seek(SeekFrom::Start(0));
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}
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// This should NOT trigger clippy warning because
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// StructWithSeekMethod does not implement std::io::Seek;
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fn seek_to_start_method_owned_false<T>(mut t: StructWithSeekMethod) {
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t.seek(SeekFrom::Start(0));
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}
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// This should NOT trigger clippy warning because
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// StructWithSeekMethod does not implement std::io::Seek;
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fn seek_to_start_false_trait(t: &mut StructWithSeekTrait) {
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t.seek(SeekFrom::Start(0));
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}
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// This should NOT trigger clippy warning because
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// StructWithSeekMethod does not implement std::io::Seek;
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fn seek_to_start_false_trait_owned<T>(mut t: StructWithSeekTrait) {
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t.seek(SeekFrom::Start(0));
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}
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// This should NOT trigger clippy warning because
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// StructWithSeekMethod does not implement std::io::Seek;
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fn seek_to_start_false_trait_bound<T: MySeekTrait>(t: &mut T) {
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t.seek(SeekFrom::Start(0));
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}
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// This should trigger clippy warning
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fn seek_to_start<T: Seek>(t: &mut T) {
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t.rewind();
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}
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// This should trigger clippy warning
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fn owned_seek_to_start<T: Seek>(mut t: T) {
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t.rewind();
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}
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// This should NOT trigger clippy warning because
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// it does not seek to start
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fn seek_to_5<T: Seek>(t: &mut T) {
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t.seek(SeekFrom::Start(5));
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}
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// This should NOT trigger clippy warning because
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// it does not seek to start
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fn seek_to_end<T: Seek>(t: &mut T) {
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t.seek(SeekFrom::End(0));
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}
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fn main() {
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let mut f = OpenOptions::new()
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.write(true)
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.read(true)
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.create(true)
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.open("foo.txt")
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.unwrap();
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let mut my_struct_trait = StructWithSeekTrait {};
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seek_to_start_false_trait_bound(&mut my_struct_trait);
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let hello = "Hello!\n";
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write!(f, "{hello}").unwrap();
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seek_to_5(&mut f);
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seek_to_end(&mut f);
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seek_to_start(&mut f);
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let mut buf = String::new();
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f.read_to_string(&mut buf).unwrap();
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assert_eq!(&buf, hello);
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}
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#[clippy::msrv = "1.54"]
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fn msrv_1_54() {
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let mut f = OpenOptions::new()
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.write(true)
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.read(true)
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.create(true)
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.open("foo.txt")
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.unwrap();
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let hello = "Hello!\n";
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write!(f, "{hello}").unwrap();
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f.seek(SeekFrom::Start(0));
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let mut buf = String::new();
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f.read_to_string(&mut buf).unwrap();
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assert_eq!(&buf, hello);
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}
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#[clippy::msrv = "1.55"]
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fn msrv_1_55() {
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let mut f = OpenOptions::new()
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.write(true)
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.read(true)
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.create(true)
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.open("foo.txt")
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.unwrap();
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let hello = "Hello!\n";
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write!(f, "{hello}").unwrap();
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f.rewind();
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let mut buf = String::new();
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f.read_to_string(&mut buf).unwrap();
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assert_eq!(&buf, hello);
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}
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