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42 lines
1.2 KiB
Rust
42 lines
1.2 KiB
Rust
#![warn(clippy::format_push_string)]
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fn main() {
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let mut string = String::new();
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string += &format!("{:?}", 1234);
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//~^ ERROR: `format!(..)` appended to existing `String`
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string.push_str(&format!("{:?}", 5678));
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//~^ ERROR: `format!(..)` appended to existing `String`
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}
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mod issue9493 {
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pub fn u8vec_to_hex(vector: &Vec<u8>, upper: bool) -> String {
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let mut hex = String::with_capacity(vector.len() * 2);
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for byte in vector {
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hex += &(if upper {
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//~^ ERROR: `format!(..)` appended to existing `String`
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format!("{byte:02X}")
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} else {
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format!("{byte:02x}")
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});
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}
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hex
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}
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pub fn other_cases() {
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let mut s = String::new();
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// if let
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s += &(if let Some(_a) = Some(1234) {
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//~^ ERROR: `format!(..)` appended to existing `String`
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format!("{}", 1234)
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} else {
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format!("{}", 1234)
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});
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// match
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s += &(match Some(1234) {
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//~^ ERROR: `format!(..)` appended to existing `String`
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Some(_) => format!("{}", 1234),
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None => format!("{}", 1234),
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});
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}
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}
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