Rust errors / Everything else
Rust compiler error · checked with rustc 1.99.0
Rust error E0436: functional record update syntax requires a struct
What it meansThe functional record update syntax was used on something other than a struct.
What rustc prints
error[E0436]: functional record update syntax requires a struct
--> main.rs:14:41
|
14 | annual_special: true, ..c // error: functional record update
| ^Real output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.
The compiler team's explanation
The functional record update syntax was used on something other than a struct.
Erroneous code example:
enum PublicationFrequency {
Weekly,
SemiMonthly { days: (u8, u8), annual_special: bool },
}
fn one_up_competitor(competitor_frequency: PublicationFrequency)
-> PublicationFrequency {
match competitor_frequency {
PublicationFrequency::Weekly => PublicationFrequency::SemiMonthly {
days: (1, 15), annual_special: false
},
c @ PublicationFrequency::SemiMonthly{ .. } =>
PublicationFrequency::SemiMonthly {
annual_special: true, ..c // error: functional record update
// syntax requires a struct
}
}
}The functional record update syntax is only allowed for structs (struct-like enum variants don't qualify, for example). To fix the previous code, rewrite the expression without functional record update syntax:
enum PublicationFrequency {
Weekly,
SemiMonthly { days: (u8, u8), annual_special: bool },
}
fn one_up_competitor(competitor_frequency: PublicationFrequency)
-> PublicationFrequency {
match competitor_frequency {
PublicationFrequency::Weekly => PublicationFrequency::SemiMonthly {
days: (1, 15), annual_special: false
},
PublicationFrequency::SemiMonthly{ days, .. } =>
PublicationFrequency::SemiMonthly {
days, annual_special: true // ok!
}
}
}From rustc --explain E0436 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
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Up next
Often hit nextE0061: this function takes N arguments but M were suppliedA related error from the same family.Read it next →Did this answer your question?