43 lines
No EOL
2.6 KiB
Rust
43 lines
No EOL
2.6 KiB
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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#[deny(cast_precision_loss, cast_possible_truncation, cast_sign_loss)]
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#[allow(dead_code)]
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fn main() {
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let i : i32 = 42;
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let u : u32 = 42;
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let f : f32 = 42.0;
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// Test cast_precision_loss
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i as f32; //~ERROR converting from i32 to f32, which causes a loss of precision (i32 is 32 bits wide, but f32's mantissa is only 23 bits wide)
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(i as i64) as f32; //~ERROR converting from i64 to f32, which causes a loss of precision (i64 is 64 bits wide, but f32's mantissa is only 23 bits wide)
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(i as i64) as f64; //~ERROR converting from i64 to f64, which causes a loss of precision (i64 is 64 bits wide, but f64's mantissa is only 52 bits wide)
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u as f32; //~ERROR converting from u32 to f32, which causes a loss of precision (u32 is 32 bits wide, but f32's mantissa is only 23 bits wide)
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(u as u64) as f32; //~ERROR converting from u64 to f32, which causes a loss of precision (u64 is 64 bits wide, but f32's mantissa is only 23 bits wide)
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(u as u64) as f64; //~ERROR converting from u64 to f64, which causes a loss of precision (u64 is 64 bits wide, but f64's mantissa is only 52 bits wide)
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i as f64; // Should not trigger the lint
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u as f64; // Should not trigger the lint
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// Test cast_possible_truncation
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f as i32; //~ERROR casting f32 to i32 may cause truncation of the value
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f as u32; //~ERROR casting f32 to u32 may cause truncation of the value
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//~^ERROR casting from f32 to u32 loses the sign of the value
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i as u8; //~ERROR casting i32 to u8 may cause truncation of the value
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//~^ERROR casting from i32 to u8 loses the sign of the value
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(f as f64) as f32; //~ERROR casting f64 to f32 may cause truncation of the value
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i as i8; //~ERROR casting i32 to i8 may cause truncation of the value
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u as i32; //~ERROR casting u32 to i32 may cause truncation of the value
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// Test cast_sign_loss
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i as u32; //~ERROR casting from i32 to u32 loses the sign of the value
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// Extra checks for usize/isize
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/*
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let is : isize = -42;
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let us : usize = 42;
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is as usize; //ERROR casting from isize to usize loses the sign of the value
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is as i8; //ERROR casting isize to i8 may cause truncation of the value
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is as f64; //ERROR converting from isize to f64, which causes a loss of precision on 64-bit architectures (isize is 64 bits wide, but f64's mantissa is only 52 bits wide)
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us as f64; //ERROR converting from usize to f64, which causes a loss of precision on 64-bit architectures (usize is 64 bits wide, but f64's mantissa is only 52 bits wide)
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*/
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} |