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Auto merge of #4035 - JoshMcguigan:useless_let_if_seq-3043, r=oli-obk

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useless_let_if_seq handle interior mutability

fixes #3043

This passes all tests, including a new one specifically dealing with a type with interior mutability. The main thing I'm unsure of is whether the span I used in the call to `is_freeze` is the most appropriate span to use, or if it matters.
This commit is contained in:
bors 2019-05-02 07:03:28 +00:00
commit 1cf5d7f04c
2 changed files with 15 additions and 0 deletions
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7
clippy_lints/src/let_if_seq.rs
View file

@ -71,6 +71,13 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for LetIfSeq {
then {
let span = stmt.span.to(if_.span);
let has_interior_mutability = !cx.tables.node_type(canonical_id).is_freeze(
cx.tcx,
cx.param_env,
span
);
if has_interior_mutability { return; }
let (default_multi_stmts, default) = if let Some(ref else_) = *else_ {
if let hir::ExprKind::Block(ref else_, _) = else_.node {
if let Some(default) = check_assign(cx, canonical_id, else_) {

8
tests/ui/let_if_seq.rs
View file

@ -108,4 +108,12 @@ fn main() {
}
baz = 1337;
// issue 3043 - types with interior mutability should not trigger this lint
use std::cell::Cell;
let mut val = Cell::new(1);
if true {
val = Cell::new(2);
}
println!("{}", val.get());
}