From 722f7d28c3daf2d568a3af77a62c489fb6a1aea2 Mon Sep 17 00:00:00 2001 From: Alex Macleod Date: Sun, 29 May 2022 18:28:34 +0000 Subject: [PATCH] needless_late_init: fix ICE when all branches return the never type --- clippy_lints/src/needless_late_init.rs | 13 +- tests/ui/needless_late_init.fixed | 49 +++++--- tests/ui/needless_late_init.rs | 49 +++++--- tests/ui/needless_late_init.stderr | 158 ++++++++++++------------- 4 files changed, 150 insertions(+), 119 deletions(-) diff --git a/clippy_lints/src/needless_late_init.rs b/clippy_lints/src/needless_late_init.rs index b70871b38be..26c694a71fe 100644 --- a/clippy_lints/src/needless_late_init.rs +++ b/clippy_lints/src/needless_late_init.rs @@ -194,14 +194,15 @@ fn assignment_suggestions<'tcx>( })) .collect::>>()?; - let applicability = if suggestions.len() > 1 { + match suggestions.len() { + // All of `exprs` are never types + // https://github.com/rust-lang/rust-clippy/issues/8911 + 0 => None, + 1 => Some((Applicability::MachineApplicable, suggestions)), // multiple suggestions don't work with rustfix in multipart_suggest // https://github.com/rust-lang/rustfix/issues/141 - Applicability::Unspecified - } else { - Applicability::MachineApplicable - }; - Some((applicability, suggestions)) + _ => Some((Applicability::Unspecified, suggestions)), + } } struct Usage<'tcx> { diff --git a/tests/ui/needless_late_init.fixed b/tests/ui/needless_late_init.fixed index 63ae6e389f3..fee8e3030b8 100644 --- a/tests/ui/needless_late_init.fixed +++ b/tests/ui/needless_late_init.fixed @@ -3,6 +3,7 @@ #![allow( unused, clippy::assign_op_pattern, + clippy::blocks_in_if_conditions, clippy::let_and_return, clippy::let_unit_value, clippy::nonminimal_bool @@ -18,6 +19,22 @@ impl std::ops::Drop for SignificantDrop { } } +fn simple() { + + let a = "zero"; + + + + let b = 1; + let c = 2; + + + let d: usize = 1; + + + let e = format!("{}", d); +} + fn main() { let n = 1; @@ -237,22 +254,20 @@ fn does_not_lint() { x = SignificantDrop; } -mod fixable { - #![allow(dead_code)] - - fn main() { - - let a = "zero"; - - - - let b = 1; - let c = 2; - - - let d: usize = 1; - - - let e = format!("{}", d); +#[rustfmt::skip] +fn issue8911() -> u32 { + let x; + match 1 { + _ if { x = 1; false } => return 1, + _ => return 2, } + + let x; + if { x = 1; true } { + return 1; + } else { + return 2; + } + + 3 } diff --git a/tests/ui/needless_late_init.rs b/tests/ui/needless_late_init.rs index 89a85c8e053..402d9f9ef7f 100644 --- a/tests/ui/needless_late_init.rs +++ b/tests/ui/needless_late_init.rs @@ -3,6 +3,7 @@ #![allow( unused, clippy::assign_op_pattern, + clippy::blocks_in_if_conditions, clippy::let_and_return, clippy::let_unit_value, clippy::nonminimal_bool @@ -18,6 +19,22 @@ fn drop(&mut self) { } } +fn simple() { + let a; + a = "zero"; + + let b; + let c; + b = 1; + c = 2; + + let d: usize; + d = 1; + + let e; + e = format!("{}", d); +} + fn main() { let a; let n = 1; @@ -237,22 +254,20 @@ macro_rules! in_macro { x = SignificantDrop; } -mod fixable { - #![allow(dead_code)] - - fn main() { - let a; - a = "zero"; - - let b; - let c; - b = 1; - c = 2; - - let d: usize; - d = 1; - - let e; - e = format!("{}", d); +#[rustfmt::skip] +fn issue8911() -> u32 { + let x; + match 1 { + _ if { x = 1; false } => return 1, + _ => return 2, } + + let x; + if { x = 1; true } { + return 1; + } else { + return 2; + } + + 3 } diff --git a/tests/ui/needless_late_init.stderr b/tests/ui/needless_late_init.stderr index d17666e03ed..f320b5b9cbb 100644 --- a/tests/ui/needless_late_init.stderr +++ b/tests/ui/needless_late_init.stderr @@ -1,10 +1,77 @@ error: unneeded late initialization - --> $DIR/needless_late_init.rs:22:5 + --> $DIR/needless_late_init.rs:23:5 + | +LL | let a; + | ^^^^^^ created here +LL | a = "zero"; + | ^^^^^^^^^^ initialised here + | + = note: `-D clippy::needless-late-init` implied by `-D warnings` +help: declare `a` here + | +LL | let a = "zero"; + | ~~~~~ + +error: unneeded late initialization + --> $DIR/needless_late_init.rs:26:5 + | +LL | let b; + | ^^^^^^ created here +LL | let c; +LL | b = 1; + | ^^^^^ initialised here + | +help: declare `b` here + | +LL | let b = 1; + | ~~~~~ + +error: unneeded late initialization + --> $DIR/needless_late_init.rs:27:5 + | +LL | let c; + | ^^^^^^ created here +LL | b = 1; +LL | c = 2; + | ^^^^^ initialised here + | +help: declare `c` here + | +LL | let c = 2; + | ~~~~~ + +error: unneeded late initialization + --> $DIR/needless_late_init.rs:31:5 + | +LL | let d: usize; + | ^^^^^^^^^^^^^ created here +LL | d = 1; + | ^^^^^ initialised here + | +help: declare `d` here + | +LL | let d: usize = 1; + | ~~~~~~~~~~~~ + +error: unneeded late initialization + --> $DIR/needless_late_init.rs:34:5 + | +LL | let e; + | ^^^^^^ created here +LL | e = format!("{}", d); + | ^^^^^^^^^^^^^^^^^^^^ initialised here + | +help: declare `e` here + | +LL | let e = format!("{}", d); + | ~~~~~ + +error: unneeded late initialization + --> $DIR/needless_late_init.rs:39:5 | LL | let a; | ^^^^^^ | - = note: `-D clippy::needless-late-init` implied by `-D warnings` help: declare `a` here | LL | let a = match n { @@ -21,7 +88,7 @@ LL | }; | + error: unneeded late initialization - --> $DIR/needless_late_init.rs:31:5 + --> $DIR/needless_late_init.rs:48:5 | LL | let b; | ^^^^^^ @@ -42,7 +109,7 @@ LL | }; | + error: unneeded late initialization - --> $DIR/needless_late_init.rs:38:5 + --> $DIR/needless_late_init.rs:55:5 | LL | let d; | ^^^^^^ @@ -63,7 +130,7 @@ LL | }; | + error: unneeded late initialization - --> $DIR/needless_late_init.rs:46:5 + --> $DIR/needless_late_init.rs:63:5 | LL | let e; | ^^^^^^ @@ -84,7 +151,7 @@ LL | }; | + error: unneeded late initialization - --> $DIR/needless_late_init.rs:53:5 + --> $DIR/needless_late_init.rs:70:5 | LL | let f; | ^^^^^^ @@ -100,7 +167,7 @@ LL + 1 => "three", | error: unneeded late initialization - --> $DIR/needless_late_init.rs:59:5 + --> $DIR/needless_late_init.rs:76:5 | LL | let g: usize; | ^^^^^^^^^^^^^ @@ -120,7 +187,7 @@ LL | }; | + error: unneeded late initialization - --> $DIR/needless_late_init.rs:67:5 + --> $DIR/needless_late_init.rs:84:5 | LL | let x; | ^^^^^^ created here @@ -134,7 +201,7 @@ LL | let x = 1; | ~~~~~ error: unneeded late initialization - --> $DIR/needless_late_init.rs:71:5 + --> $DIR/needless_late_init.rs:88:5 | LL | let x; | ^^^^^^ created here @@ -148,7 +215,7 @@ LL | let x = SignificantDrop; | ~~~~~ error: unneeded late initialization - --> $DIR/needless_late_init.rs:75:5 + --> $DIR/needless_late_init.rs:92:5 | LL | let x; | ^^^^^^ created here @@ -162,7 +229,7 @@ LL | let x = SignificantDrop; | ~~~~~ error: unneeded late initialization - --> $DIR/needless_late_init.rs:94:5 + --> $DIR/needless_late_init.rs:111:5 | LL | let a; | ^^^^^^ @@ -183,7 +250,7 @@ LL | }; | + error: unneeded late initialization - --> $DIR/needless_late_init.rs:111:5 + --> $DIR/needless_late_init.rs:128:5 | LL | let a; | ^^^^^^ @@ -203,72 +270,5 @@ help: add a semicolon after the `match` expression LL | }; | + -error: unneeded late initialization - --> $DIR/needless_late_init.rs:244:9 - | -LL | let a; - | ^^^^^^ created here -LL | a = "zero"; - | ^^^^^^^^^^ initialised here - | -help: declare `a` here - | -LL | let a = "zero"; - | ~~~~~ - -error: unneeded late initialization - --> $DIR/needless_late_init.rs:247:9 - | -LL | let b; - | ^^^^^^ created here -LL | let c; -LL | b = 1; - | ^^^^^ initialised here - | -help: declare `b` here - | -LL | let b = 1; - | ~~~~~ - -error: unneeded late initialization - --> $DIR/needless_late_init.rs:248:9 - | -LL | let c; - | ^^^^^^ created here -LL | b = 1; -LL | c = 2; - | ^^^^^ initialised here - | -help: declare `c` here - | -LL | let c = 2; - | ~~~~~ - -error: unneeded late initialization - --> $DIR/needless_late_init.rs:252:9 - | -LL | let d: usize; - | ^^^^^^^^^^^^^ created here -LL | d = 1; - | ^^^^^ initialised here - | -help: declare `d` here - | -LL | let d: usize = 1; - | ~~~~~~~~~~~~ - -error: unneeded late initialization - --> $DIR/needless_late_init.rs:255:9 - | -LL | let e; - | ^^^^^^ created here -LL | e = format!("{}", d); - | ^^^^^^^^^^^^^^^^^^^^ initialised here - | -help: declare `e` here - | -LL | let e = format!("{}", d); - | ~~~~~ - error: aborting due to 16 previous errors