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Auto merge of #4934 - illicitonion:exhaustive_match, r=flip1995

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Update wildcard enum match lint for non_exhaustive enums

changelog: wildcard_enum_match_arm gives better suggestions for non_exhaustive enums
This commit is contained in:
bors 2019-12-23 17:00:38 +00:00
commit 37b7970a7c
4 changed files with 88 additions and 13 deletions
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13
clippy_lints/src/matches.rs
View file

@ -522,7 +522,7 @@ fn check_wild_enum_match(cx: &LateContext<'_, '_>, ex: &Expr, arms: &[Arm]) {
}
}
let suggestion: Vec<String> = missing_variants
let mut suggestion: Vec<String> = missing_variants
.iter()
.map(|v| {
let suffix = match v.ctor_kind {
@ -543,11 +543,20 @@ fn check_wild_enum_match(cx: &LateContext<'_, '_>, ex: &Expr, arms: &[Arm]) {
return;
}
let mut message = "wildcard match will miss any future added variants";
if let ty::Adt(def, _) = ty.kind {
if def.is_variant_list_non_exhaustive() {
message = "match on non-exhaustive enum doesn't explicitly match all known variants";
suggestion.push(String::from("_"));
}
}
span_lint_and_sugg(
cx,
WILDCARD_ENUM_MATCH_ARM,
wildcard_span,
"wildcard match will miss any future added variants.",
message,
"try this",
suggestion.join(" | "),
Applicability::MachineApplicable,

32
tests/ui/wildcard_enum_match_arm.fixed
View file

@ -1,7 +1,9 @@
// run-rustfix
#![deny(clippy::wildcard_enum_match_arm)]
#![allow(unreachable_code, unused_variables, dead_code)]
#![allow(unreachable_code, unused_variables, dead_code, clippy::single_match)]
use std::io::ErrorKind;
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
enum Color {
@ -62,4 +64,32 @@ fn main() {
140 => {},
_ => {},
};
// We need to use an enum not defined in this test because non_exhaustive is ignored for the
// purposes of dead code analysis within a crate.
let error_kind = ErrorKind::NotFound;
match error_kind {
ErrorKind::NotFound => {},
std::io::ErrorKind::PermissionDenied | std::io::ErrorKind::ConnectionRefused | std::io::ErrorKind::ConnectionReset | std::io::ErrorKind::ConnectionAborted | std::io::ErrorKind::NotConnected | std::io::ErrorKind::AddrInUse | std::io::ErrorKind::AddrNotAvailable | std::io::ErrorKind::BrokenPipe | std::io::ErrorKind::AlreadyExists | std::io::ErrorKind::WouldBlock | std::io::ErrorKind::InvalidInput | std::io::ErrorKind::InvalidData | std::io::ErrorKind::TimedOut | std::io::ErrorKind::WriteZero | std::io::ErrorKind::Interrupted | std::io::ErrorKind::Other | std::io::ErrorKind::UnexpectedEof | _ => {},
}
match error_kind {
ErrorKind::NotFound => {},
ErrorKind::PermissionDenied => {},
ErrorKind::ConnectionRefused => {},
ErrorKind::ConnectionReset => {},
ErrorKind::ConnectionAborted => {},
ErrorKind::NotConnected => {},
ErrorKind::AddrInUse => {},
ErrorKind::AddrNotAvailable => {},
ErrorKind::BrokenPipe => {},
ErrorKind::AlreadyExists => {},
ErrorKind::WouldBlock => {},
ErrorKind::InvalidInput => {},
ErrorKind::InvalidData => {},
ErrorKind::TimedOut => {},
ErrorKind::WriteZero => {},
ErrorKind::Interrupted => {},
ErrorKind::Other => {},
ErrorKind::UnexpectedEof => {},
_ => {},
}
}

32
tests/ui/wildcard_enum_match_arm.rs
View file

@ -1,7 +1,9 @@
// run-rustfix
#![deny(clippy::wildcard_enum_match_arm)]
#![allow(unreachable_code, unused_variables, dead_code)]
#![allow(unreachable_code, unused_variables, dead_code, clippy::single_match)]
use std::io::ErrorKind;
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
enum Color {
@ -62,4 +64,32 @@ fn main() {
140 => {},
_ => {},
};
// We need to use an enum not defined in this test because non_exhaustive is ignored for the
// purposes of dead code analysis within a crate.
let error_kind = ErrorKind::NotFound;
match error_kind {
ErrorKind::NotFound => {},
_ => {},
}
match error_kind {
ErrorKind::NotFound => {},
ErrorKind::PermissionDenied => {},
ErrorKind::ConnectionRefused => {},
ErrorKind::ConnectionReset => {},
ErrorKind::ConnectionAborted => {},
ErrorKind::NotConnected => {},
ErrorKind::AddrInUse => {},
ErrorKind::AddrNotAvailable => {},
ErrorKind::BrokenPipe => {},
ErrorKind::AlreadyExists => {},
ErrorKind::WouldBlock => {},
ErrorKind::InvalidInput => {},
ErrorKind::InvalidData => {},
ErrorKind::TimedOut => {},
ErrorKind::WriteZero => {},
ErrorKind::Interrupted => {},
ErrorKind::Other => {},
ErrorKind::UnexpectedEof => {},
_ => {},
}
}

24
tests/ui/wildcard_enum_match_arm.stderr
View file

@ -1,5 +1,5 @@
error: wildcard match will miss any future added variants.
--> $DIR/wildcard_enum_match_arm.rs:29:9
error: wildcard match will miss any future added variants
--> $DIR/wildcard_enum_match_arm.rs:31:9
|
LL | _ => eprintln!("Not red"),
| ^ help: try this: `Color::Green | Color::Blue | Color::Rgb(..) | Color::Cyan`
@ -10,23 +10,29 @@ note: lint level defined here
LL | #![deny(clippy::wildcard_enum_match_arm)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: wildcard match will miss any future added variants.
--> $DIR/wildcard_enum_match_arm.rs:33:9
error: wildcard match will miss any future added variants
--> $DIR/wildcard_enum_match_arm.rs:35:9
|
LL | _not_red => eprintln!("Not red"),
| ^^^^^^^^ help: try this: `_not_red @ Color::Green | _not_red @ Color::Blue | _not_red @ Color::Rgb(..) | _not_red @ Color::Cyan`
error: wildcard match will miss any future added variants.
--> $DIR/wildcard_enum_match_arm.rs:37:9
error: wildcard match will miss any future added variants
--> $DIR/wildcard_enum_match_arm.rs:39:9
|
LL | not_red => format!("{:?}", not_red),
| ^^^^^^^ help: try this: `not_red @ Color::Green | not_red @ Color::Blue | not_red @ Color::Rgb(..) | not_red @ Color::Cyan`
error: wildcard match will miss any future added variants.
--> $DIR/wildcard_enum_match_arm.rs:53:9
error: wildcard match will miss any future added variants
--> $DIR/wildcard_enum_match_arm.rs:55:9
|
LL | _ => "No red",
| ^ help: try this: `Color::Red | Color::Green | Color::Blue | Color::Rgb(..) | Color::Cyan`
error: aborting due to 4 previous errors
error: match on non-exhaustive enum doesn't explicitly match all known variants
--> $DIR/wildcard_enum_match_arm.rs:72:9
|
LL | _ => {},
| ^ help: try this: `std::io::ErrorKind::PermissionDenied | std::io::ErrorKind::ConnectionRefused | std::io::ErrorKind::ConnectionReset | std::io::ErrorKind::ConnectionAborted | std::io::ErrorKind::NotConnected | std::io::ErrorKind::AddrInUse | std::io::ErrorKind::AddrNotAvailable | std::io::ErrorKind::BrokenPipe | std::io::ErrorKind::AlreadyExists | std::io::ErrorKind::WouldBlock | std::io::ErrorKind::InvalidInput | std::io::ErrorKind::InvalidData | std::io::ErrorKind::TimedOut | std::io::ErrorKind::WriteZero | std::io::ErrorKind::Interrupted | std::io::ErrorKind::Other | std::io::ErrorKind::UnexpectedEof | _`
error: aborting due to 5 previous errors