Remove _Alignas from list of unsupported features in README

README

@@ -0,0 +1,66 @@
+= Language.C =
+
+Language.C is a parser and pretty-printer framework for C11 and the extensions of gcc.
+
+See http://visq.github.io/language-c/
+
+== Build and Install ==
+
+cabal install
+
+-- or --
+
+runhaskell Setup.hs configure FLAGS
+runhaskell Setup.hs build
+runhaskell Setup.hs install
+
+Provide the set of flags passing
+ --flags="<flags-seperated-by-space>"
+to configure.
+
+== Compatibility ==
+
+Tested with GHC 8.0, 8.2, 8.4, 8.6, 8.8 and 8.10
+
+It is recommended to use the most recent platform release: http://hackage.haskell.org/platform/.
+
+== C Language Compatibility ==
+
+Currently unsupported C11 constructs:
+ - static assertion 6.7.10 (_Static_assert)
+ - generic selection 6.5.1.1 (_Generic)
+ - _Atomic, _Thread_local
+ - Universal character names
+
+Currently unsupported GNU C extensions:
+ - __auto_type
+ - __builtin_offsetof
+   char a[__builtin_offsetof (struct S, sa->f)
+ - _Decimal32
+ - Extended assembler
+   __asm__ __volatile__ ("" : : : );
+   __asm__ goto ("" : : : : label);
+ - __attribute__((packed)): types featuring this attribute may have an
+   incorrect size or alignment calculated.
+
+IEC 60559:
+  Since language-c-0.8, extended floating point types are supported (gcc 7 feature). Package maintainers may decide to disable these types (flag iecFpExtension) to work around the fact that the _Float128 type is redefined by glibc >= 2.26 if gcc < 7 is used for preprocessing:
+  /* The type _Float128 exists only since GCC 7.0.  */
+  # if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+  typedef __float128 _Float128;
+  # endif
+
+== Sources ==
+
+see src/README
+
+== Examples ==
+
+A couple of small examples are available in /examples
+
+== Testing ==
+
+A couple of regression tests can be run via
+> cd test/harness; make
+
+For more tests, see test/README.

src/Language/C/Parser/Parser.y

@@ -1147,8 +1147,8 @@ struct_declaration_list :: { Reversed [CDecl] }
 struct_declaration_list
   : {- empty -}						{ RList.empty }
   | struct_declaration_list ';'				{ $1 }
-  | struct_declaration_list struct_declaration		{ $1 `snoc` ( if ( containsAlign $1 ) then ( addAlign $2 ( getAlign $1 ) ) else $2 ) }
-  | struct_declaration_list alignment_specifier struct_declaration		{ $1 `snoc` ( addAlign $3 $2 )}
+  | struct_declaration_list struct_declaration		{ $1 `RList.snoc` ( if ( containsAlign $1 ) then ( addAlign $2 ( getAlign $1 ) ) else $2 ) }
+  | struct_declaration_list alignment_specifier struct_declaration		{ $1 `RList.snoc` ( addAlign $3 $2 )}
 
 
 -- parse C structure declaration (C99 6.7.2.1)