113 lines
2.3 KiB
Rust
113 lines
2.3 KiB
Rust
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#[warn(eq_op)]
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#[allow(identity_op, double_parens, many_single_char_names)]
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#[allow(no_effect, unused_variables, unnecessary_operation, short_circuit_statement)]
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#[warn(nonminimal_bool)]
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fn main() {
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// simple values and comparisons
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1 == 1;
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"no" == "no";
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// even though I agree that no means no ;-)
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false != false;
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1.5 < 1.5;
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1u64 >= 1u64;
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// casts, methods, parentheses
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(1 as u64) & (1 as u64);
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1 ^ ((((((1))))));
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// unary and binary operators
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(-(2) < -(2));
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((1 + 1) & (1 + 1) == (1 + 1) & (1 + 1));
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(1 * 2) + (3 * 4) == 1 * 2 + 3 * 4;
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// various other things
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([1] != [1]);
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((1, 2) != (1, 2));
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vec![1, 2, 3] == vec![1, 2, 3]; //no error yet, as we don't match macros
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// const folding
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1 + 1 == 2;
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1 - 1 == 0;
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1 - 1;
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1 / 1;
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true && true;
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true || true;
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let a: u32 = 0;
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let b: u32 = 0;
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a == b && b == a;
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a != b && b != a;
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a < b && b > a;
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a <= b && b >= a;
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let mut a = vec![1];
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a == a;
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2*a.len() == 2*a.len(); // ok, functions
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a.pop() == a.pop(); // ok, functions
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use std::ops::BitAnd;
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struct X(i32);
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impl BitAnd for X {
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type Output = X;
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fn bitand(self, rhs: X) -> X {
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X(self.0 & rhs.0)
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}
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}
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impl<'a> BitAnd<&'a X> for X {
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type Output = X;
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fn bitand(self, rhs: &'a X) -> X {
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X(self.0 & rhs.0)
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}
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}
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let x = X(1);
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let y = X(2);
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let z = x & &y;
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#[derive(Copy, Clone)]
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struct Y(i32);
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impl BitAnd for Y {
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type Output = Y;
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fn bitand(self, rhs: Y) -> Y {
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Y(self.0 & rhs.0)
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}
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}
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impl<'a> BitAnd<&'a Y> for Y {
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type Output = Y;
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fn bitand(self, rhs: &'a Y) -> Y {
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Y(self.0 & rhs.0)
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}
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}
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let x = Y(1);
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let y = Y(2);
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let z = x & &y;
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check_ignore_macro();
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// named constants
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const A: u32 = 10;
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const B: u32 = 10;
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const C: u32 = A / B; // ok, different named constants
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const D: u32 = A / A;
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}
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macro_rules! check_if_named_foo {
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($expression:expr) => (
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if stringify!($expression) == "foo" {
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println!("foo!");
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} else {
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println!("not foo.");
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}
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)
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}
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fn check_ignore_macro() {
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check_if_named_foo!(foo);
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}
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