57 lines
1.1 KiB
Rust
Executable File
57 lines
1.1 KiB
Rust
Executable File
#![feature(plugin)]
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#![plugin(clippy)]
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#[deny(string_add)]
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#[allow(string_add_assign)]
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fn add_only() { // ignores assignment distinction
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let mut x = "".to_owned();
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for _ in 1..3 {
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x = x + "."; //~ERROR you added something to a string.
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}
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let y = "".to_owned();
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let z = y + "..."; //~ERROR you added something to a string.
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assert_eq!(&x, &z);
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}
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#[deny(string_add_assign)]
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fn add_assign_only() {
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let mut x = "".to_owned();
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for _ in 1..3 {
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x = x + "."; //~ERROR you assigned the result of adding something to this string.
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}
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let y = "".to_owned();
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let z = y + "...";
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assert_eq!(&x, &z);
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}
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#[deny(string_add, string_add_assign)]
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fn both() {
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let mut x = "".to_owned();
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for _ in 1..3 {
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x = x + "."; //~ERROR you assigned the result of adding something to this string.
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}
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let y = "".to_owned();
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let z = y + "..."; //~ERROR you added something to a string.
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assert_eq!(&x, &z);
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}
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fn main() {
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add_only();
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add_assign_only();
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both();
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// the add is only caught for String
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let mut x = 1;
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x = x + 1;
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assert_eq!(2, x);
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}
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