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print the unit type () in related lint messages.

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This commit is contained in:
Matthias Krüger 2020-09-09 17:59:13 +02:00
parent 8b54f1e2d9
commit de195f2d3d
4 changed files with 44 additions and 44 deletions
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6
clippy_lints/src/map_unit_fn.rs
View File

@ -9,7 +9,7 @@ use rustc_span::source_map::Span;
declare_clippy_lint! {
/// **What it does:** Checks for usage of `option.map(f)` where f is a function
/// or closure that returns the unit type.
/// or closure that returns the unit type `()`.
///
/// **Why is this bad?** Readability, this can be written more clearly with
/// an if let statement
@ -51,7 +51,7 @@ declare_clippy_lint! {
declare_clippy_lint! {
/// **What it does:** Checks for usage of `result.map(f)` where f is a function
/// or closure that returns the unit type.
/// or closure that returns the unit type `()`.
///
/// **Why is this bad?** Readability, this can be written more clearly with
/// an if let statement
@ -197,7 +197,7 @@ fn let_binding_name(cx: &LateContext<'_>, var_arg: &hir::Expr<'_>) -> String {
#[must_use]
fn suggestion_msg(function_type: &str, map_type: &str) -> String {
format!(
"called `map(f)` on an `{0}` value where `f` is a {1} that returns the unit type",
"called `map(f)` on an `{0}` value where `f` is a {1} that returns the unit type `()`",
map_type, function_type
)
}

36
tests/ui/option_map_unit_fn_fixable.stderr
View File

@ -1,4 +1,4 @@
error: called `map(f)` on an `Option` value where `f` is a function that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a function that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:38:5
|
LL | x.field.map(do_nothing);
@ -8,7 +8,7 @@ LL | x.field.map(do_nothing);
|
= note: `-D clippy::option-map-unit-fn` implied by `-D warnings`
error: called `map(f)` on an `Option` value where `f` is a function that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a function that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:40:5
|
LL | x.field.map(do_nothing);
@ -16,7 +16,7 @@ LL | x.field.map(do_nothing);
| |
| help: try this: `if let Some(x_field) = x.field { do_nothing(x_field) }`
error: called `map(f)` on an `Option` value where `f` is a function that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a function that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:42:5
|
LL | x.field.map(diverge);
@ -24,7 +24,7 @@ LL | x.field.map(diverge);
| |
| help: try this: `if let Some(x_field) = x.field { diverge(x_field) }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:48:5
|
LL | x.field.map(|value| x.do_option_nothing(value + captured));
@ -32,7 +32,7 @@ LL | x.field.map(|value| x.do_option_nothing(value + captured));
| |
| help: try this: `if let Some(value) = x.field { x.do_option_nothing(value + captured) }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:50:5
|
LL | x.field.map(|value| { x.do_option_plus_one(value + captured); });
@ -40,7 +40,7 @@ LL | x.field.map(|value| { x.do_option_plus_one(value + captured); });
| |
| help: try this: `if let Some(value) = x.field { x.do_option_plus_one(value + captured); }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:53:5
|
LL | x.field.map(|value| do_nothing(value + captured));
@ -48,7 +48,7 @@ LL | x.field.map(|value| do_nothing(value + captured));
| |
| help: try this: `if let Some(value) = x.field { do_nothing(value + captured) }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:55:5
|
LL | x.field.map(|value| { do_nothing(value + captured) });
@ -56,7 +56,7 @@ LL | x.field.map(|value| { do_nothing(value + captured) });
| |
| help: try this: `if let Some(value) = x.field { do_nothing(value + captured) }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:57:5
|
LL | x.field.map(|value| { do_nothing(value + captured); });
@ -64,7 +64,7 @@ LL | x.field.map(|value| { do_nothing(value + captured); });
| |
| help: try this: `if let Some(value) = x.field { do_nothing(value + captured); }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:59:5
|
LL | x.field.map(|value| { { do_nothing(value + captured); } });
@ -72,7 +72,7 @@ LL | x.field.map(|value| { { do_nothing(value + captured); } });
| |
| help: try this: `if let Some(value) = x.field { do_nothing(value + captured); }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:62:5
|
LL | x.field.map(|value| diverge(value + captured));
@ -80,7 +80,7 @@ LL | x.field.map(|value| diverge(value + captured));
| |
| help: try this: `if let Some(value) = x.field { diverge(value + captured) }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:64:5
|
LL | x.field.map(|value| { diverge(value + captured) });
@ -88,7 +88,7 @@ LL | x.field.map(|value| { diverge(value + captured) });
| |
| help: try this: `if let Some(value) = x.field { diverge(value + captured) }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:66:5
|
LL | x.field.map(|value| { diverge(value + captured); });
@ -96,7 +96,7 @@ LL | x.field.map(|value| { diverge(value + captured); });
| |
| help: try this: `if let Some(value) = x.field { diverge(value + captured); }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:68:5
|
LL | x.field.map(|value| { { diverge(value + captured); } });
@ -104,7 +104,7 @@ LL | x.field.map(|value| { { diverge(value + captured); } });
| |
| help: try this: `if let Some(value) = x.field { diverge(value + captured); }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:73:5
|
LL | x.field.map(|value| { let y = plus_one(value + captured); });
@ -112,7 +112,7 @@ LL | x.field.map(|value| { let y = plus_one(value + captured); });
| |
| help: try this: `if let Some(value) = x.field { let y = plus_one(value + captured); }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:75:5
|
LL | x.field.map(|value| { plus_one(value + captured); });
@ -120,7 +120,7 @@ LL | x.field.map(|value| { plus_one(value + captured); });
| |
| help: try this: `if let Some(value) = x.field { plus_one(value + captured); }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:77:5
|
LL | x.field.map(|value| { { plus_one(value + captured); } });
@ -128,7 +128,7 @@ LL | x.field.map(|value| { { plus_one(value + captured); } });
| |
| help: try this: `if let Some(value) = x.field { plus_one(value + captured); }`
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a closure that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:80:5
|
LL | x.field.map(|ref value| { do_nothing(value + captured) });
@ -136,7 +136,7 @@ LL | x.field.map(|ref value| { do_nothing(value + captured) });
| |
| help: try this: `if let Some(ref value) = x.field { do_nothing(value + captured) }`
error: called `map(f)` on an `Option` value where `f` is a function that returns the unit type
error: called `map(f)` on an `Option` value where `f` is a function that returns the unit type `()`
--> $DIR/option_map_unit_fn_fixable.rs:82:5
|
LL | option().map(do_nothing);}

34
tests/ui/result_map_unit_fn_fixable.stderr
View File

@ -1,4 +1,4 @@
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:35:5
|
LL | x.field.map(do_nothing);
@ -8,7 +8,7 @@ LL | x.field.map(do_nothing);
|
= note: `-D clippy::result-map-unit-fn` implied by `-D warnings`
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:37:5
|
LL | x.field.map(do_nothing);
@ -16,7 +16,7 @@ LL | x.field.map(do_nothing);
| |
| help: try this: `if let Ok(x_field) = x.field { do_nothing(x_field) }`
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:39:5
|
LL | x.field.map(diverge);
@ -24,7 +24,7 @@ LL | x.field.map(diverge);
| |
| help: try this: `if let Ok(x_field) = x.field { diverge(x_field) }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:45:5
|
LL | x.field.map(|value| x.do_result_nothing(value + captured));
@ -32,7 +32,7 @@ LL | x.field.map(|value| x.do_result_nothing(value + captured));
| |
| help: try this: `if let Ok(value) = x.field { x.do_result_nothing(value + captured) }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:47:5
|
LL | x.field.map(|value| { x.do_result_plus_one(value + captured); });
@ -40,7 +40,7 @@ LL | x.field.map(|value| { x.do_result_plus_one(value + captured); });
| |
| help: try this: `if let Ok(value) = x.field { x.do_result_plus_one(value + captured); }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:50:5
|
LL | x.field.map(|value| do_nothing(value + captured));
@ -48,7 +48,7 @@ LL | x.field.map(|value| do_nothing(value + captured));
| |
| help: try this: `if let Ok(value) = x.field { do_nothing(value + captured) }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:52:5
|
LL | x.field.map(|value| { do_nothing(value + captured) });
@ -56,7 +56,7 @@ LL | x.field.map(|value| { do_nothing(value + captured) });
| |
| help: try this: `if let Ok(value) = x.field { do_nothing(value + captured) }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:54:5
|
LL | x.field.map(|value| { do_nothing(value + captured); });
@ -64,7 +64,7 @@ LL | x.field.map(|value| { do_nothing(value + captured); });
| |
| help: try this: `if let Ok(value) = x.field { do_nothing(value + captured); }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:56:5
|
LL | x.field.map(|value| { { do_nothing(value + captured); } });
@ -72,7 +72,7 @@ LL | x.field.map(|value| { { do_nothing(value + captured); } });
| |
| help: try this: `if let Ok(value) = x.field { do_nothing(value + captured); }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:59:5
|
LL | x.field.map(|value| diverge(value + captured));
@ -80,7 +80,7 @@ LL | x.field.map(|value| diverge(value + captured));
| |
| help: try this: `if let Ok(value) = x.field { diverge(value + captured) }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:61:5
|
LL | x.field.map(|value| { diverge(value + captured) });
@ -88,7 +88,7 @@ LL | x.field.map(|value| { diverge(value + captured) });
| |
| help: try this: `if let Ok(value) = x.field { diverge(value + captured) }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:63:5
|
LL | x.field.map(|value| { diverge(value + captured); });
@ -96,7 +96,7 @@ LL | x.field.map(|value| { diverge(value + captured); });
| |
| help: try this: `if let Ok(value) = x.field { diverge(value + captured); }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:65:5
|
LL | x.field.map(|value| { { diverge(value + captured); } });
@ -104,7 +104,7 @@ LL | x.field.map(|value| { { diverge(value + captured); } });
| |
| help: try this: `if let Ok(value) = x.field { diverge(value + captured); }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:70:5
|
LL | x.field.map(|value| { let y = plus_one(value + captured); });
@ -112,7 +112,7 @@ LL | x.field.map(|value| { let y = plus_one(value + captured); });
| |
| help: try this: `if let Ok(value) = x.field { let y = plus_one(value + captured); }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:72:5
|
LL | x.field.map(|value| { plus_one(value + captured); });
@ -120,7 +120,7 @@ LL | x.field.map(|value| { plus_one(value + captured); });
| |
| help: try this: `if let Ok(value) = x.field { plus_one(value + captured); }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:74:5
|
LL | x.field.map(|value| { { plus_one(value + captured); } });
@ -128,7 +128,7 @@ LL | x.field.map(|value| { { plus_one(value + captured); } });
| |
| help: try this: `if let Ok(value) = x.field { plus_one(value + captured); }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_fixable.rs:77:5
|
LL | x.field.map(|ref value| { do_nothing(value + captured) });

12
tests/ui/result_map_unit_fn_unfixable.stderr
View File

@ -1,4 +1,4 @@
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_unfixable.rs:23:5
|
LL | x.field.map(|value| { do_nothing(value); do_nothing(value) });
@ -8,7 +8,7 @@ LL | x.field.map(|value| { do_nothing(value); do_nothing(value) });
|
= note: `-D clippy::result-map-unit-fn` implied by `-D warnings`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_unfixable.rs:25:5
|
LL | x.field.map(|value| if value > 0 { do_nothing(value); do_nothing(value) });
@ -16,7 +16,7 @@ LL | x.field.map(|value| if value > 0 { do_nothing(value); do_nothing(value)
| |
| help: try this: `if let Ok(value) = x.field { ... }`
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_unfixable.rs:29:5
|
LL | x.field.map(|value| {
@ -30,7 +30,7 @@ LL | || });
| |_______|
|
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`
--> $DIR/result_map_unit_fn_unfixable.rs:33:5
|
LL | x.field.map(|value| { do_nothing(value); do_nothing(value); });
@ -38,7 +38,7 @@ LL | x.field.map(|value| { do_nothing(value); do_nothing(value); });
| |
| help: try this: `if let Ok(value) = x.field { ... }`
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type `()`
--> $DIR/result_map_unit_fn_unfixable.rs:37:5
|
LL | "12".parse::<i32>().map(diverge);
@ -46,7 +46,7 @@ LL | "12".parse::<i32>().map(diverge);
| |
| help: try this: `if let Ok(a) = "12".parse::<i32>() { diverge(a) }`
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type
error: called `map(f)` on an `Result` value where `f` is a function that returns the unit type `()`
--> $DIR/result_map_unit_fn_unfixable.rs:43:5
|
LL | y.map(do_nothing);