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Bad suggestion of useless_let_if_seq
when having side effects.
#4124
Labels
L-suggestion
Lint: Improving, adding or fixing lint suggestions
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flip1995
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the
L-suggestion
Lint: Improving, adding or fixing lint suggestions
label
May 21, 2019
bors
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May 15, 2020
Downgrade useless_let_if_seq to nursery I feel that this lint has the wrong balance of incorrect suggestions for a default-enabled lint. The immediate code I faced was something like: ```rust fn main() { let mut good = do1(); if !do2() { good = false; } if good { println!("good"); } } fn do1() -> bool { println!("1"); false } fn do2() -> bool { println!("2"); false } ``` On this code Clippy calls it unidiomatic and suggests the following diff, which has different behavior in a way that I don't necessarily want. ```diff - let mut good = do1(); - if !do2() { - good = false; - } + let good = if !do2() { + false + } else { + do1() + }; ``` On exploring issues filed about this lint, I have found that other users have also struggled with inappropriate suggestions (#4124, #3043, #2918, #2176) and suggestions that make the code worse (#3769, #2749). Overall I believe that this lint is still at nursery quality for now and should not be enabled. --- changelog: Remove useless_let_if_seq from default set of enabled lints
bors
added a commit
that referenced
this issue
May 15, 2020
Downgrade useless_let_if_seq to nursery I feel that this lint has the wrong balance of incorrect suggestions for a default-enabled lint. The immediate code I faced was something like: ```rust fn main() { let mut good = do1(); if !do2() { good = false; } if good { println!("good"); } } fn do1() -> bool { println!("1"); false } fn do2() -> bool { println!("2"); false } ``` On this code Clippy calls it unidiomatic and suggests the following diff, which has different behavior in a way that I don't necessarily want. ```diff - let mut good = do1(); - if !do2() { - good = false; - } + let good = if !do2() { + false + } else { + do1() + }; ``` On exploring issues filed about this lint, I have found that other users have also struggled with inappropriate suggestions (#4124, #3043, #2918, #2176) and suggestions that make the code worse (#3769, #2749). Overall I believe that this lint is still at nursery quality for now and should not be enabled. --- changelog: Remove useless_let_if_seq from default set of enabled lints
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The version of clippy is
0.0.212
.Here's an example:
It suggest writing
let <mut> ret = if cond() { .. foo2() .. } else { foo1() };
, which cause 3 function calls (may have side-effects) being reordered, andfoo1()
not always being called.Well, I'm not sure how to write make it more idiomatic in this case...
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