proc_macro
source link: https://doc.rust-lang.org/proc_macro/fn.is_available.html
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Function proc_macro::is_available1.57.0[−][src]
pub fn is_available() -> boolDetermines whether proc_macro has been made accessible to the currently running program.
The proc_macro crate is only intended for use inside the implementation of procedural macros. All the functions in this crate panic if invoked from outside of a procedural macro, such as from a build script or unit test or ordinary Rust binary.
With consideration for Rust libraries that are designed to support both
macro and non-macro use cases, proc_macro::is_available() provides a
non-panicking way to detect whether the infrastructure required to use the
API of proc_macro is presently available. Returns true if invoked from
inside of a procedural macro, false if invoked from any other binary.
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