packages: Mark 'replacement' as an "innate" field.

Suggested by Mark H Weaver
at <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00355.html>.

* guix/packages.scm (<package>)[replacement]: Mark as "innate".
* gnu/packages/base.scm (glibc-2.25-patched, glibc-2.24)
(glibc-2.23, glibc-2.22, glibc-2.21, glibc-locales): Remove
'replacement' field, which was set to #f.
* gnu/packages/commencement.scm (perl-boot0): Likewise.
* gnu/packages/fontutils.scm (graphite2/fixed): Likewise.
* gnu/packages/ghostscript.scm (ghostscript/fixed): Likewise.
* gnu/packages/gnupg.scm (libgcrypt-1.7.8): Likewise.
* gnu/packages/guile.scm (guile-2.0/fixed, guile-2.2): Likewise.
* gnu/packages/icu4c.scm (icu4c/fixed): Likewise.
* gnu/packages/image.scm (libpng-apng): Likewise.
* gnu/packages/make-bootstrap.scm (%guile-static): Likewise.
* gnu/packages/pcre.scm (pcre/fixed): Likewise.
* gnu/packages/perl.scm (perl/fixed): Likewise.
* gnu/packages/ruby.scm (ruby-2.3, ruby-2.2, ruby-2.1)
(ruby-1.8): Likewise.
* gnu/packages/tls.scm (gnutls-3.5.13, gnutls/guile-2.2): Likewise.
* gnu/packages/xml.scm (expat-2.2.1): Likewise.

gnu/packages/base.scm

@@ -905,7 +905,6 @@ GLIBC/HURD for a Hurd host"
 (define glibc-2.25-patched
   (package
     (inherit glibc)
-    (replacement #f)
     (source (origin
               (inherit (package-source glibc))
               (patches (search-patches "glibc-ldd-x86_64.patch"
@@ -923,7 +922,6 @@ GLIBC/HURD for a Hurd host"
   (package
     (inherit glibc)
     (version "2.24")
-    (replacement #f)
     (source (origin
               (inherit (package-source glibc))
               (uri (string-append "mirror://gnu/glibc/glibc-"
@@ -943,7 +941,6 @@ GLIBC/HURD for a Hurd host"
   (package
     (inherit glibc)
     (version "2.23")
-    (replacement #f)
     (source (origin
               (inherit (package-source glibc))
               (uri (string-append "mirror://gnu/glibc/glibc-"
@@ -963,7 +960,6 @@ GLIBC/HURD for a Hurd host"
   (package
     (inherit glibc)
     (version "2.22")
-    (replacement #f)
     (source (origin
               (inherit (package-source glibc))
               (uri (string-append "mirror://gnu/glibc/glibc-"
@@ -991,7 +987,6 @@ GLIBC/HURD for a Hurd host"
   (package
     (inherit glibc-2.22)
     (version "2.21")
-    (replacement #f)
     (source (origin
               (inherit (package-source glibc-2.22))
               (uri (string-append "mirror://gnu/glibc/glibc-"
@@ -1004,7 +999,6 @@ GLIBC/HURD for a Hurd host"
   (package
     (inherit glibc)
     (name "glibc-locales")
-    (replacement #f)
     (source (origin (inherit (package-source glibc))
                     (patches (cons (search-patch "glibc-locales.patch")
                                    (origin-patches (package-source glibc))))))

gnu/packages/commencement.scm

@@ -294,7 +294,6 @@
   (let ((perl (package
                 (inherit perl)
                 (name "perl-boot0")
-                (replacement #f)
                 (arguments
                  ;; At the very least, this must not depend on GCC & co.
                  (let ((args `(#:disallowed-references

gnu/packages/fontutils.scm

@@ -415,7 +415,6 @@ and returns a sequence of positioned glyphids from the font.")
   (package
     (inherit graphite2)
     (name "graphite2")
-    (replacement #f)
     (source
      (origin
        (method url-fetch)

gnu/packages/ghostscript.scm

@@ -219,7 +219,6 @@ output file formats and printers.")
 (define ghostscript/fixed
   (package
     (inherit ghostscript)
-    (replacement #f)
     (source
       (origin
         (inherit (package-source ghostscript))

gnu/packages/gnupg.scm

@@ -119,7 +119,6 @@ generation.")
 (define libgcrypt-1.7.8
   (package
     (inherit libgcrypt)
-    (replacement #f)
     (version "1.7.8")
     (source (origin
              (method url-fetch)
@@ -131,7 +130,6 @@ generation.")
 
 (define-public libgcrypt-1.5
   (package (inherit libgcrypt)
-    (replacement #f)
     (version "1.5.6")
     (source
      (origin

gnu/packages/guile.scm

@@ -217,14 +217,12 @@ without requiring the source code to be rewritten.")
   ;; in the `base' module, and thus changing it entails a full rebuild.
   (package
     (inherit guile-2.0)
-    (properties '((hidden? . #t)))          ;people should install 'guile-2.0'
+    (properties '((hidden? . #t)))))        ;people should install 'guile-2.0'
-    (replacement #f)))
 
 (define-public guile-2.2
   (package (inherit guile-2.0)
     (name "guile")
     (version "2.2.2")
-    (replacement #f)
     (source (origin
               (method url-fetch)
               (uri (string-append "mirror://gnu/guile/guile-" version

gnu/packages/icu4c.scm

@@ -71,7 +71,6 @@ C/C++ part.")
 (define icu4c/fixed
   (package
     (inherit icu4c)
-    (replacement #f)
     (source (origin
               (inherit (package-source icu4c))
               (patches

gnu/packages/image.scm

@@ -94,7 +94,6 @@ library.  It supports almost all PNG features and is extensible.")
 (define-public libpng-apng
   (package
     (inherit libpng)
-    (replacement #f) ;libpng's replacement doesn't apply here
     (name "libpng-apng")
     (version (package-version libpng))
     (arguments

gnu/packages/make-bootstrap.scm

@@ -509,7 +509,6 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
                     (patches patches)))
          (guile (package (inherit guile-2.0)
                   (name (string-append (package-name guile-2.0) "-static"))
-                  (replacement #f)
                   (source source)
                   (synopsis "Statically-linked and relocatable Guile")
 

gnu/packages/pcre.scm

@@ -75,7 +75,6 @@ POSIX regular expression API.")
 (define pcre/fixed
   (package
     (inherit pcre)
-    (replacement #f)
     (source (origin
               (inherit (package-source pcre))
               (patches (search-patches "pcre-CVE-2017-7186.patch"))))))

gnu/packages/perl.scm

@@ -151,7 +151,6 @@
 (define perl/fixed
   (package
     (inherit perl)
-    (replacement #f)
     (source
       (origin
         (inherit (package-source perl))

gnu/packages/ruby.scm

@@ -106,7 +106,6 @@ a focus on simplicity and productivity.")
   (package
     (inherit ruby)
     (version "2.3.4")
-    (replacement #f)
     (source
      (origin
        (method url-fetch)
@@ -124,7 +123,6 @@ a focus on simplicity and productivity.")
 
 (define-public ruby-2.2
   (package (inherit ruby)
-    (replacement #f)
     (version "2.2.7")
     (source
      (origin
@@ -138,7 +136,6 @@ a focus on simplicity and productivity.")
 
 (define-public ruby-2.1
   (package (inherit ruby)
-    (replacement #f)
     (version "2.1.10")
     (source
      (origin
@@ -172,7 +169,6 @@ a focus on simplicity and productivity.")
 
 (define-public ruby-1.8
   (package (inherit ruby)
-    (replacement #f)
     (version "1.8.7-p374")
     (source
      (origin

gnu/packages/tls.scm

@@ -222,7 +222,6 @@ required structures.")
     ;; We use 'D' instead of '13' here to keep the store file name at
     ;; the same length. See <https://bugs.gnu.org/27308>.
     (version "3.5.D")
-    (replacement #f)
     (source (origin
               (method url-fetch)
               (uri
@@ -240,7 +239,6 @@ required structures.")
   ;; GnuTLS for Guile 2.2.  This is supported by GnuTLS >= 3.5.5.
   (package
     (inherit gnutls)
-    (replacement #f)
     (source (package-source gnutls-3.5.13))
     (name "guile2.2-gnutls")
     (arguments

gnu/packages/xml.scm

@@ -79,7 +79,6 @@ things the parser might find in the XML document (like start tags).")
   (package
     (inherit expat)
     (version "2.2.1")
-    (replacement #f)
     (source (origin
              (method url-fetch)
              (uri (string-append "mirror://sourceforge/expat/expat/"

guix/packages.scm

@@ -269,8 +269,11 @@ name of its URI."
                                                   ; inputs
   (native-search-paths package-native-search-paths (default '()))
   (search-paths package-search-paths (default '()))
+
+  ;; The 'replacement' field is marked as "innate" because it never makes
+  ;; sense to inherit a replacement as is.  See the 'package/inherit' macro.
   (replacement package-replacement                ; package | #f
-               (default #f) (thunked))
+               (default #f) (thunked) (innate))
 
   (synopsis package-synopsis)                    ; one-line description
   (description package-description)              ; one or two paragraphs