Add infallible expr scanner fallback for scanning invalid code #340
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warning: this function's return value is unnecessarily wrapped by `Result`
--> impl/src/fmt.rs:122:1
|
122 | / fn explicit_named_args(input: ParseStream) -> Result<Set<Ident>> {
123 | | let ahead = input.fork();
124 | | if let Ok(set) = try_explicit_named_args(&ahead) {
125 | | input.advance_to(&ahead);
... |
136 | | Ok(Set::new())
137 | | }
| |_^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_wraps
= note: `-W clippy::unnecessary-wraps` implied by `-W clippy::pedantic`
= help: to override `-W clippy::pedantic` add `#[allow(clippy::unnecessary_wraps)]`
help: remove `Result` from the return type...
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122 | fn explicit_named_args(input: ParseStream) -> std::collections::BTreeSet<proc_macro2::Ident> {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
help: ...and then change returning expressions
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126 ~ return set;
127 | }
...
131 | input.advance_to(&ahead);
132 ~ return set;
133 | }
134 |
135 | input.parse::<TokenStream>().unwrap();
136 ~ Set::new()
|
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The infallible scanner has the same behavior as prior to #337, which exhibits bugs like #335 but that's okay because fallback is only going to be applied if the format arguments do not consist of syntactically valid expressions. This is useful for an IDE performing macro expansions while code is being typed.