gnu: Add rust-proc-macro-crate-0.1.

* gnu/packages/crates-io.scm (rust-proc-macro-crate-0.1): New variable.

gnu/packages/crates-io.scm

@@ -20199,6 +20199,29 @@ (define-public rust-prettytable-rs-0.8
 formatted tables in terminal.")
     (license license:bsd-3)))
 
+(define-public rust-proc-macro-crate-0.1
+  (package
+    (name "rust-proc-macro-crate")
+    (version "0.1.5")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "proc-macro-crate" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "11cpihdk9ba68hzw95aa8zxn0i5g6kdrfd4l2cy3d5jvb72a6vhx"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       (("rust-toml" ,rust-toml-0.5))))
+    (home-page "https://github.com/bkchr/proc-macro-crate")
+    (synopsis "Support for @code{$crate} in procedural macros")
+    (description
+     "This crate provides a way to get the name of a crate, even if it
+renamed in @file{Cargo.toml}.")
+    (license (list license:asl2.0 license:expat))))
+
 (define-public rust-proc-macro-error-1
   (package
     (name "rust-proc-macro-error")