diff options
Diffstat (limited to 'tests/ui/lint/dead-code/self-assign.rs')
| -rw-r--r-- | tests/ui/lint/dead-code/self-assign.rs | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/tests/ui/lint/dead-code/self-assign.rs b/tests/ui/lint/dead-code/self-assign.rs index 072a899e1bd..357846baf22 100644 --- a/tests/ui/lint/dead-code/self-assign.rs +++ b/tests/ui/lint/dead-code/self-assign.rs @@ -1,19 +1,29 @@ -// Test that dead code warnings are issued for superfluous assignments of -// fields or variables to themselves (issue #75356). - -//@ ignore-test FIXME(81658, 83171) +//! Test that dead code warnings are issued for superfluous assignments of fields or variables to +//! themselves (issue #75356). +//! +//! # History of this test (to aid relanding of a fixed version of #81473) +//! +//! - Original lint request was about self-assignments not triggering sth like `dead_code`. +//! - `dead_code` lint expansion for self-assignments was implemented in #87129. +//! - Unfortunately implementation components of #87129 had to be disabled as part of reverts +//! #86212, #83171 (to revert #81473) to address regressions #81626 and #81658. +//! - Consequently, none of the following warnings are emitted. //@ check-pass + +// Implementation of self-assignment `dead_code` lint expansions disabled due to reverts. +//@ known-bug: #75356 + #![allow(unused_assignments)] #![warn(dead_code)] fn main() { let mut x = 0; x = x; - //~^ WARNING: useless assignment of variable of type `i32` to itself + // FIXME ~^ WARNING: useless assignment of variable of type `i32` to itself x = (x); - //~^ WARNING: useless assignment of variable of type `i32` to itself + // FIXME ~^ WARNING: useless assignment of variable of type `i32` to itself x = {x}; // block expressions don't count as self-assignments @@ -22,10 +32,10 @@ fn main() { struct S<'a> { f: &'a str } let mut s = S { f: "abc" }; s = s; - //~^ WARNING: useless assignment of variable of type `S` to itself + // FIXME ~^ WARNING: useless assignment of variable of type `S` to itself s.f = s.f; - //~^ WARNING: useless assignment of field of type `&str` to itself + // FIXME ~^ WARNING: useless assignment of field of type `&str` to itself struct N0 { x: Box<i32> } @@ -34,11 +44,11 @@ fn main() { struct N3 { n: N2 }; let mut n3 = N3 { n: N2(N1 { n: N0 { x: Box::new(42) } }) }; n3.n.0.n.x = n3.n.0.n.x; - //~^ WARNING: useless assignment of field of type `Box<i32>` to itself + // FIXME ~^ WARNING: useless assignment of field of type `Box<i32>` to itself let mut t = (1, ((2, 3, (4, 5)),)); t.1.0.2.1 = t.1.0.2.1; - //~^ WARNING: useless assignment of field of type `i32` to itself + // FIXME ~^ WARNING: useless assignment of field of type `i32` to itself let mut y = 0; |