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Implemented in #78837.
With this feature arbitrary expressions are supported in values of key-value attributes at parse time.
#[my_attr = EXPR]
Previously only unsuffixed literals and interpolated expressions ($expr) were accepted.
If the attribute in question survives expansion, then the value is still restricted to unsuffixed literals by a semantic check. This restriction may also be relaxed in the future.
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Area: Attributes (`#[…]`, `#![…]`)Area: The parsing of Rust source code to an ASTBlocker: Implemented in the nightly compiler and unstable.Category: A tracking issue for an RFC or an unstable feature.`#![feature(extended_key_value_attributes)]Relevant to the language team, which will review and decide on the PR/issue.