The above is the only supported idiom for exhaustive matching of those enum. Do not write anything differently as it is not supported.
The conditional compilation on match-arms lets us fail your tests but not break your library when adding a variant. You will be notified by a test failure when a variant is added, so that you can add code to handle it, but your library will continue to compile and work for downstream users in the interim.
1.0.59
Parse empty supertrait lists consistently with rustc (#952)
Fix loss of span information on comma tokens inside of Type::Tuple during parse (#959)
1.0.58
Allow literals to parse as a const generic path argument even without "full" feature enabled (#951)
pub struct Struct {
array: Array<10>, // used to require `features = "full"`
}
1.0.57
Make Punctuated::new available as a const fn (#949)
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Bumps syn from 0.15.40 to 1.0.60.
Release notes
Sourced from syn's releases.
... (truncated)
Commits
5b4a2d2
Release 1.0.6066a9047
Link to rust-lang/rust#44109269b422
Prevent external instantiation of the nonexhaustive variants1368867
Rename to __TestExhaustive8d62642
Merge pull request #962 from dtolnay/testexhaustive8b70266
Provide an exhaustive matching idiom for syntax tree enumsd6bbbe2
Merge pull request #961 from dtolnay/hiddendffc40d
Do nonexhaustive detection based on doc(hidden) attributef30253a
Parse variant attributes from ast_enum_of_structs72c006c
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