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Fix constant promotion stuff

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This commit is contained in:
Manish Goregaokar 2017-10-19 10:16:03 -07:00
parent 1f81dcbebd
commit 3e108b7190
2 changed files with 17 additions and 67 deletions
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28
clippy_lints/src/methods.rs
View file

@ -821,18 +821,6 @@ fn lint_or_fun_call(cx: &LateContext, expr: &hir::Expr, name: &str, args: &[hir:
or_has_args: bool,
span: Span,
) {
// don't lint for constant values
// FIXME: can we `expect` here instead of match?
let promotable = cx.tcx
.rvalue_promotable_to_static
.borrow()
.get(&arg.id)
.cloned()
.unwrap_or(true);
if promotable {
return;
}
// (path, fn_has_argument, methods, suffix)
let know_types: &[(&[_], _, &[_], _)] = &[
(&paths::BTREEMAP_ENTRY, false, &["or_insert"], "with"),
@ -841,6 +829,22 @@ fn lint_or_fun_call(cx: &LateContext, expr: &hir::Expr, name: &str, args: &[hir:
(&paths::RESULT, true, &["or", "unwrap_or"], "else"),
];
// early check if the name is one we care about
if know_types.iter().all(|k| !k.2.contains(&name)) {
return;
}
// don't lint for constant values
// FIXME: can we `expect` here instead of match?
let owner = cx.tcx.hir.get_parent(arg.id);
let owner_def = cx.tcx.hir.local_def_id(owner);
let promotable = cx.tcx
.rvalue_promotable_map(owner_def)
.contains_key(&arg.hir_id.local_id);
if promotable {
return;
}
let self_ty = cx.tables.expr_ty(self_expr);
let (fn_has_arguments, poss, suffix) = if let Some(&(_, fn_has_arguments, poss, suffix)) =

56
tests/ui/methods.stderr
View file

@ -318,37 +318,13 @@ error: unnecessary structure name repetition
263 | fn new() -> Foo { Foo }
| ^^^ help: use the applicable keyword: `Self`
error: use of `unwrap_or` followed by a function call
--> $DIR/methods.rs:281:5
|
281 | with_constructor.unwrap_or(make());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_constructor.unwrap_or_else(make)`
|
= note: `-D or-fun-call` implied by `-D warnings`
error: use of `unwrap_or` followed by a call to `new`
--> $DIR/methods.rs:284:5
|
284 | with_new.unwrap_or(Vec::new());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_new.unwrap_or_default()`
error: use of `unwrap_or` followed by a function call
--> $DIR/methods.rs:287:5
|
287 | with_const_args.unwrap_or(Vec::with_capacity(12));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_const_args.unwrap_or_else(|| Vec::with_capacity(12))`
error: use of `unwrap_or` followed by a function call
--> $DIR/methods.rs:290:5
|
290 | with_err.unwrap_or(make());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_err.unwrap_or_else(|_| make())`
error: use of `unwrap_or` followed by a function call
--> $DIR/methods.rs:293:5
|
293 | with_err_args.unwrap_or(Vec::with_capacity(12));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_err_args.unwrap_or_else(|_| Vec::with_capacity(12))`
= note: `-D or-fun-call` implied by `-D warnings`
error: use of `unwrap_or` followed by a call to `default`
--> $DIR/methods.rs:296:5
@ -362,36 +338,6 @@ error: use of `unwrap_or` followed by a call to `default`
299 | with_default_type.unwrap_or(u64::default());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_default_type.unwrap_or_default()`
error: use of `unwrap_or` followed by a function call
--> $DIR/methods.rs:302:5
|
302 | with_vec.unwrap_or(vec![]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_vec.unwrap_or_else(|| < [ _ ] > :: into_vec ( box [ $ ( $ x ) , * ] ))`
error: use of `unwrap_or` followed by a function call
--> $DIR/methods.rs:307:5
|
307 | without_default.unwrap_or(Foo::new());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `without_default.unwrap_or_else(Foo::new)`
error: use of `or_insert` followed by a function call
--> $DIR/methods.rs:310:5
|
310 | map.entry(42).or_insert(String::new());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `map.entry(42).or_insert_with(String::new)`
error: use of `or_insert` followed by a function call
--> $DIR/methods.rs:313:5
|
313 | btree.entry(42).or_insert(String::new());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `btree.entry(42).or_insert_with(String::new)`
error: use of `unwrap_or` followed by a function call
--> $DIR/methods.rs:316:13
|
316 | let _ = stringy.unwrap_or("".to_owned());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `stringy.unwrap_or_else(|| "".to_owned())`
error: called `.iter().nth()` on a Vec. Calling `.get()` is both faster and more readable
--> $DIR/methods.rs:327:23
|