gnu: Add rust-derive-builder-0.9.

* gnu/packages/crates-io.scm (rust-derive-builder-0.9,
  rust-derive-builder-core-0.9): New variables.
  (rust-derive-builder-0.5, rust-derive-builder-core-0.2): Inherit from
  newer versions.

gnu/packages/crates-io.scm

@@ -5462,8 +5462,42 @@ and arithmetic.")
     (description "Demo of proc-macro-hack.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-derive-builder-0.9
+  (package
+    (name "rust-derive-builder")
+    (version "0.9.0")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "derive-builder" version))
+        (file-name
+          (string-append name "-" version ".tar.gz"))
+        (sha256
+          (base32
+            "1h4f8vnggmpyw27fznl3cpyjrzz1nw5xrxx6ca3zcb3z54hqcrd2"))))
+    (build-system cargo-build-system)
+    (arguments
+      `(#:cargo-inputs
+        (("rust-compiletest-rs" ,rust-compiletest-rs-0.3)
+         ("rust-darling" ,rust-darling-0.10)
+         ("rust-derive-builder-core" ,rust-derive-builder-core-0.9)
+         ("rust-env-logger" ,rust-env-logger-0.5)
+         ("rust-log" ,rust-log-0.4)
+         ("rust-proc-macro2" ,rust-proc-macro2-1)
+         ("rust-quote" ,rust-quote-1)
+         ("rust-skeptic" ,rust-skeptic-0.13)
+         ("rust-syn" ,rust-syn-1))
+        #:cargo-development-inputs
+        (("rust-pretty-assertions" ,rust-pretty-assertions-0.6))))
+    (home-page "https://github.com/colin-kiegel/rust-derive-builder")
+    (synopsis "Builder pattern for arbitrary structs")
+    (description "Rust macro to automatically implement the builder pattern
+for arbitrary structs.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-derive-builder-0.5
   (package
+    (inherit rust-derive-builder-0.9)
     (name "rust-derive-builder")
     (version "0.5.1")
     (source
@@ -5473,7 +5507,6 @@ and arithmetic.")
        (file-name (string-append name "-" version ".tar.gz"))
        (sha256
         (base32 "0fgl8dsigr7h70clxjq8xmsfc021w5ag262wfgcqv0ian1m8x6cc"))))
-    (build-system cargo-build-system)
     (arguments
      `(#:cargo-inputs
        (("rust-compiletest-rs" ,rust-compiletest-rs-0.3)
@@ -5487,15 +5520,40 @@ and arithmetic.")
        (("rust-env-logger" ,rust-env-logger-0.4)
         ("rust-log" ,rust-log-0.3)
         ("rust-pretty-assertions" ,rust-pretty-assertions-0.2)
-        ("rust-skeptic" ,rust-skeptic-0.9))))
+        ("rust-skeptic" ,rust-skeptic-0.9))))))
+
+(define-public rust-derive-builder-core-0.9
+  (package
+    (name "rust-derive-builder-core")
+    (version "0.9.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "derive-builder-core" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "1vwb8nwls4lhd2yiyj87kmwws4mmfqfrjcr0pk09b11c6wzfm497"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-darling" ,rust-darling-0.10)
+        ("rust-log" ,rust-log-0.4)
+        ("rust-proc-macro2" ,rust-proc-macro2-1)
+        ("rust-quote" ,rust-quote-1)
+        ("rust-syn" ,rust-syn-1))
+       #:cargo-development-inputs
+       (("rust-pretty-assertions" ,rust-pretty-assertions-0.6))))
     (home-page "https://github.com/colin-kiegel/rust-derive-builder")
-    (synopsis "Builder pattern for arbitrary structs")
+    (synopsis "Internal helper library for @code{rust-derive-builder}")
-    (description "Rust macro to automatically implement the builder pattern
+    (description
-for arbitrary structs.")
+     "Internal helper library for @code{rust-derive-builder}.")
-    (license (list license:expat license:asl2.0))) )
+    (license (list license:expat license:asl2.0))))
 
 (define-public rust-derive-builder-core-0.2
   (package
+    (inherit rust-derive-builder-core-0.9)
     (name "rust-derive-builder-core")
     (version "0.2.0")
     (source
@@ -5505,18 +5563,13 @@ for arbitrary structs.")
        (file-name (string-append name "-" version ".tar.gz"))
        (sha256
         (base32 "0mxpl1ja3l60w1v5vr3733hr5mcpds2hfl6shrmy3a2zkvp28pkk"))))
-    (build-system cargo-build-system)
     (arguments
      `(#:cargo-inputs
        (("rust-log" ,rust-log-0.3)
         ("rust-quote" ,rust-quote-0.3)
         ("rust-syn" ,rust-syn-0.11))
        #:cargo-development-inputs
-       (("rust-pretty-assertions" ,rust-pretty-assertions-0.2))))
+       (("rust-pretty-assertions" ,rust-pretty-assertions-0.2))))))
-    (home-page "https://github.com/colin-kiegel/rust-derive-builder")
-    (synopsis "Internal helper library for the derive_builder crate")
-    (description "Internal helper library for the derive_builder crate.")
-    (license (list license:expat license:asl2.0))))
 
 (define-public rust-derive-more-0.99
   (package