Macro blob 

blob!() { /* proc-macro */ }

blob!(<vis> static NAME, <path-expr>);

<path-expr> is forwarded verbatim to include_bytes!, so any expression that the latter accepts works — a string literal, or e.g. concat!(env!("OUT_DIR"), "/blob.bin") for a build-script-generated file.

Expands to:

#[used]
#[unsafe(link_section = ".lrodata.<lowercased name>")]
<vis> static NAME: [u8; const { include_bytes!("path/to/data").len() }]
    = *include_bytes!("path/to/data");

([u8; _] is not yet allowed in static item signatures on stable, so the length is computed via a const block. include_bytes! is evaluated at compile time and the resulting array is deduplicated, so the binary only carries one copy of the data.)