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Rollup merge of #70566 - jumbatm:exceeding-bitshifts-constprop, r=RalfJung

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Don't bail out before linting in generic contexts.

Fixes #69021.

cc #70017

r? @RalfJung
This commit is contained in:
Dylan DPC 2020-04-16 16:34:23 +02:00 committed by GitHub
commit 33500a2bbf
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 133 additions and 115 deletions
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10
src/librustc_mir/transform/const_prop.rs
View File

@ -581,11 +581,6 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
return None;
}
// FIXME we need to revisit this for #67176
if rvalue.needs_subst() {
return None;
}
// Perform any special handling for specific Rvalue types.
// Generally, checks here fall into one of two categories:
// 1. Additional checking to provide useful lints to the user
@ -626,6 +621,11 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
_ => {}
}
// FIXME we need to revisit this for #67176
if rvalue.needs_subst() {
return None;
}
self.use_ecx(|this| {
trace!("calling eval_rvalue_into_place(rvalue = {:?}, place = {:?})", rvalue, place);
this.ecx.eval_rvalue_into_place(rvalue, place)?;

62
src/test/ui/lint/lint-exceeding-bitshifts.noopt.stderr
View File

@ -1,146 +1,152 @@
error: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:22:13
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:18:20
|
LL | let _ = x << 42;
| ^^^^^^^ attempt to shift left with overflow
LL | const N: i32 = T::N << 42;
| ^^^^^^^^^^ attempt to shift left with overflow
|
note: the lint level is defined here
--> $DIR/lint-exceeding-bitshifts.rs:9:9
|
LL | #![deny(arithmetic_overflow, const_err)]
LL | #![warn(arithmetic_overflow, const_err)]
| ^^^^^^^^^^^^^^^^^^^
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:22:13
|
LL | let _ = x << 42;
| ^^^^^^^ attempt to shift left with overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:27:15
|
LL | let n = 1u8 << 8;
| ^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:29:15
|
LL | let n = 1u16 << 16;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:31:15
|
LL | let n = 1u32 << 32;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:33:15
|
LL | let n = 1u64 << 64;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:35:15
|
LL | let n = 1i8 << 8;
| ^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:37:15
|
LL | let n = 1i16 << 16;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:39:15
|
LL | let n = 1i32 << 32;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:41:15
|
LL | let n = 1i64 << 64;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:44:15
|
LL | let n = 1u8 >> 8;
| ^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:46:15
|
LL | let n = 1u16 >> 16;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:48:15
|
LL | let n = 1u32 >> 32;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:50:15
|
LL | let n = 1u64 >> 64;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:52:15
|
LL | let n = 1i8 >> 8;
| ^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:54:15
|
LL | let n = 1i16 >> 16;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:56:15
|
LL | let n = 1i32 >> 32;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:58:15
|
LL | let n = 1i64 >> 64;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:62:15
|
LL | let n = n << 8;
| ^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:64:15
|
LL | let n = 1u8 << -8;
| ^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:69:15
|
LL | let n = 1u8 << (4+4);
| ^^^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:71:15
|
LL | let n = 1i64 >> [64][0];
| ^^^^^^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:77:15
|
LL | let n = 1_isize << BITS;
| ^^^^^^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:78:15
|
LL | let n = 1_usize << BITS;
| ^^^^^^^^^^^^^^^ attempt to shift left with overflow
error: aborting due to 23 previous errors
warning: 24 warnings emitted

62
src/test/ui/lint/lint-exceeding-bitshifts.opt.stderr
View File

@ -1,146 +1,152 @@
error: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:22:13
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:18:20
|
LL | let _ = x << 42;
| ^^^^^^^ attempt to shift left with overflow
LL | const N: i32 = T::N << 42;
| ^^^^^^^^^^ attempt to shift left with overflow
|
note: the lint level is defined here
--> $DIR/lint-exceeding-bitshifts.rs:9:9
|
LL | #![deny(arithmetic_overflow, const_err)]
LL | #![warn(arithmetic_overflow, const_err)]
| ^^^^^^^^^^^^^^^^^^^
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:22:13
|
LL | let _ = x << 42;
| ^^^^^^^ attempt to shift left with overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:27:15
|
LL | let n = 1u8 << 8;
| ^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:29:15
|
LL | let n = 1u16 << 16;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:31:15
|
LL | let n = 1u32 << 32;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:33:15
|
LL | let n = 1u64 << 64;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:35:15
|
LL | let n = 1i8 << 8;
| ^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:37:15
|
LL | let n = 1i16 << 16;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:39:15
|
LL | let n = 1i32 << 32;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:41:15
|
LL | let n = 1i64 << 64;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:44:15
|
LL | let n = 1u8 >> 8;
| ^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:46:15
|
LL | let n = 1u16 >> 16;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:48:15
|
LL | let n = 1u32 >> 32;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:50:15
|
LL | let n = 1u64 >> 64;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:52:15
|
LL | let n = 1i8 >> 8;
| ^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:54:15
|
LL | let n = 1i16 >> 16;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:56:15
|
LL | let n = 1i32 >> 32;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:58:15
|
LL | let n = 1i64 >> 64;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:62:15
|
LL | let n = n << 8;
| ^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:64:15
|
LL | let n = 1u8 << -8;
| ^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:69:15
|
LL | let n = 1u8 << (4+4);
| ^^^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:71:15
|
LL | let n = 1i64 >> [64][0];
| ^^^^^^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:77:15
|
LL | let n = 1_isize << BITS;
| ^^^^^^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:78:15
|
LL | let n = 1_usize << BITS;
| ^^^^^^^^^^^^^^^ attempt to shift left with overflow
error: aborting due to 23 previous errors
warning: 24 warnings emitted

62
src/test/ui/lint/lint-exceeding-bitshifts.opt_with_overflow_checks.stderr
View File

@ -1,146 +1,152 @@
error: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:22:13
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:18:20
|
LL | let _ = x << 42;
| ^^^^^^^ attempt to shift left with overflow
LL | const N: i32 = T::N << 42;
| ^^^^^^^^^^ attempt to shift left with overflow
|
note: the lint level is defined here
--> $DIR/lint-exceeding-bitshifts.rs:9:9
|
LL | #![deny(arithmetic_overflow, const_err)]
LL | #![warn(arithmetic_overflow, const_err)]
| ^^^^^^^^^^^^^^^^^^^
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:22:13
|
LL | let _ = x << 42;
| ^^^^^^^ attempt to shift left with overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:27:15
|
LL | let n = 1u8 << 8;
| ^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:29:15
|
LL | let n = 1u16 << 16;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:31:15
|
LL | let n = 1u32 << 32;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:33:15
|
LL | let n = 1u64 << 64;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:35:15
|
LL | let n = 1i8 << 8;
| ^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:37:15
|
LL | let n = 1i16 << 16;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:39:15
|
LL | let n = 1i32 << 32;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:41:15
|
LL | let n = 1i64 << 64;
| ^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:44:15
|
LL | let n = 1u8 >> 8;
| ^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:46:15
|
LL | let n = 1u16 >> 16;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:48:15
|
LL | let n = 1u32 >> 32;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:50:15
|
LL | let n = 1u64 >> 64;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:52:15
|
LL | let n = 1i8 >> 8;
| ^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:54:15
|
LL | let n = 1i16 >> 16;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:56:15
|
LL | let n = 1i32 >> 32;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:58:15
|
LL | let n = 1i64 >> 64;
| ^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:62:15
|
LL | let n = n << 8;
| ^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:64:15
|
LL | let n = 1u8 << -8;
| ^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:69:15
|
LL | let n = 1u8 << (4+4);
| ^^^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:71:15
|
LL | let n = 1i64 >> [64][0];
| ^^^^^^^^^^^^^^^ attempt to shift right with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:77:15
|
LL | let n = 1_isize << BITS;
| ^^^^^^^^^^^^^^^ attempt to shift left with overflow
error: this arithmetic operation will overflow
warning: this arithmetic operation will overflow
--> $DIR/lint-exceeding-bitshifts.rs:78:15
|
LL | let n = 1_usize << BITS;
| ^^^^^^^^^^^^^^^ attempt to shift left with overflow
error: aborting due to 23 previous errors
warning: 24 warnings emitted

52
src/test/ui/lint/lint-exceeding-bitshifts.rs
View File

@ -3,10 +3,10 @@
//[opt]compile-flags: -O
//[opt_with_overflow_checks]compile-flags: -C overflow-checks=on -O
// build-fail
// build-pass
#![crate_type="lib"]
#![deny(arithmetic_overflow, const_err)]
#![warn(arithmetic_overflow, const_err)]
#![allow(unused_variables)]
#![allow(dead_code)]
@ -15,65 +15,65 @@ pub trait Foo {
}
impl<T: Foo> Foo for Vec<T> {
const N: i32 = T::N << 42; // FIXME this should warn
const N: i32 = T::N << 42; //~ WARN: arithmetic operation will overflow
}
pub fn foo(x: i32) {
let _ = x << 42; //~ ERROR: arithmetic operation will overflow
let _ = x << 42; //~ WARN: arithmetic operation will overflow
}
pub fn main() {
let n = 1u8 << 7;
let n = 1u8 << 8; //~ ERROR: arithmetic operation will overflow
let n = 1u8 << 8; //~ WARN: arithmetic operation will overflow
let n = 1u16 << 15;
let n = 1u16 << 16; //~ ERROR: arithmetic operation will overflow
let n = 1u16 << 16; //~ WARN: arithmetic operation will overflow
let n = 1u32 << 31;
let n = 1u32 << 32; //~ ERROR: arithmetic operation will overflow
let n = 1u32 << 32; //~ WARN: arithmetic operation will overflow
let n = 1u64 << 63;
let n = 1u64 << 64; //~ ERROR: arithmetic operation will overflow
let n = 1u64 << 64; //~ WARN: arithmetic operation will overflow
let n = 1i8 << 7;
let n = 1i8 << 8; //~ ERROR: arithmetic operation will overflow
let n = 1i8 << 8; //~ WARN: arithmetic operation will overflow
let n = 1i16 << 15;
let n = 1i16 << 16; //~ ERROR: arithmetic operation will overflow
let n = 1i16 << 16; //~ WARN: arithmetic operation will overflow
let n = 1i32 << 31;
let n = 1i32 << 32; //~ ERROR: arithmetic operation will overflow
let n = 1i32 << 32; //~ WARN: arithmetic operation will overflow
let n = 1i64 << 63;
let n = 1i64 << 64; //~ ERROR: arithmetic operation will overflow
let n = 1i64 << 64; //~ WARN: arithmetic operation will overflow
let n = 1u8 >> 7;
let n = 1u8 >> 8; //~ ERROR: arithmetic operation will overflow
let n = 1u8 >> 8; //~ WARN: arithmetic operation will overflow
let n = 1u16 >> 15;
let n = 1u16 >> 16; //~ ERROR: arithmetic operation will overflow
let n = 1u16 >> 16; //~ WARN: arithmetic operation will overflow
let n = 1u32 >> 31;
let n = 1u32 >> 32; //~ ERROR: arithmetic operation will overflow
let n = 1u32 >> 32; //~ WARN: arithmetic operation will overflow
let n = 1u64 >> 63;
let n = 1u64 >> 64; //~ ERROR: arithmetic operation will overflow
let n = 1u64 >> 64; //~ WARN: arithmetic operation will overflow
let n = 1i8 >> 7;
let n = 1i8 >> 8; //~ ERROR: arithmetic operation will overflow
let n = 1i8 >> 8; //~ WARN: arithmetic operation will overflow
let n = 1i16 >> 15;
let n = 1i16 >> 16; //~ ERROR: arithmetic operation will overflow
let n = 1i16 >> 16; //~ WARN: arithmetic operation will overflow
let n = 1i32 >> 31;
let n = 1i32 >> 32; //~ ERROR: arithmetic operation will overflow
let n = 1i32 >> 32; //~ WARN: arithmetic operation will overflow
let n = 1i64 >> 63;
let n = 1i64 >> 64; //~ ERROR: arithmetic operation will overflow
let n = 1i64 >> 64; //~ WARN: arithmetic operation will overflow
let n = 1u8;
let n = n << 7;
let n = n << 8; //~ ERROR: arithmetic operation will overflow
let n = n << 8; //~ WARN: arithmetic operation will overflow
let n = 1u8 << -8; //~ ERROR: arithmetic operation will overflow
let n = 1u8 << -8; //~ WARN: arithmetic operation will overflow
let n = 1i8<<(1isize+-1);
let n = 1u8 << (4+3);
let n = 1u8 << (4+4); //~ ERROR: arithmetic operation will overflow
let n = 1u8 << (4+4); //~ WARN: arithmetic operation will overflow
let n = 1i64 >> [63][0];
let n = 1i64 >> [64][0]; //~ ERROR: arithmetic operation will overflow
let n = 1i64 >> [64][0]; //~ WARN: arithmetic operation will overflow
#[cfg(target_pointer_width = "32")]
const BITS: usize = 32;
#[cfg(target_pointer_width = "64")]
const BITS: usize = 64;
let n = 1_isize << BITS; //~ ERROR: arithmetic operation will overflow
let n = 1_usize << BITS; //~ ERROR: arithmetic operation will overflow
let n = 1_isize << BITS; //~ WARN: arithmetic operation will overflow
let n = 1_usize << BITS; //~ WARN: arithmetic operation will overflow
}