109 lines
1.9 KiB
Rust
109 lines
1.9 KiB
Rust
#[warn(clippy::eval_order_dependence)]
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#[allow(
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unused_assignments,
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unused_variables,
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clippy::many_single_char_names,
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clippy::no_effect,
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dead_code,
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clippy::blacklisted_name
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)]
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fn main() {
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let mut x = 0;
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let a = {
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x = 1;
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1
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} + x;
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// Example from iss#277
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x += {
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x = 20;
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2
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};
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// Does it work in weird places?
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// ...in the base for a struct expression?
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struct Foo {
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a: i32,
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b: i32,
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};
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let base = Foo { a: 4, b: 5 };
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let foo = Foo {
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a: x,
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..{
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x = 6;
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base
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}
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};
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// ...inside a closure?
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let closure = || {
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let mut x = 0;
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x += {
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x = 20;
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2
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};
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};
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// ...not across a closure?
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let mut y = 0;
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let b = (y, || y = 1);
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// && and || evaluate left-to-right.
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let a = {
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x = 1;
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true
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} && (x == 3);
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let a = {
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x = 1;
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true
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} || (x == 3);
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// Make sure we don't get confused by alpha conversion.
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let a = {
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let mut x = 1;
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x = 2;
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1
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} + x;
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// No warning if we don't read the variable...
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x = {
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x = 20;
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2
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};
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// ...if the assignment is in a closure...
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let b = {
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|| {
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x = 1;
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};
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1
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} + x;
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// ... or the access is under an address.
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let b = (
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{
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let p = &x;
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1
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},
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{
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x = 1;
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x
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},
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);
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// Limitation: l-values other than simple variables don't trigger
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// the warning.
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let mut tup = (0, 0);
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let c = {
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tup.0 = 1;
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1
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} + tup.0;
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// Limitation: you can get away with a read under address-of.
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let mut z = 0;
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let b = (
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&{
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z = x;
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x
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},
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{
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x = 3;
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x
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},
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);
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}
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