Deprecate hexstrings

Author: wilzbach

deprecate.dd

@@ -10,6 +10,7 @@ $(SPEC_S Deprecated Features,
 
     $(TABLE2 Deprecated Features,
         $(THEAD Feature,                                                          Spec,  Dep,    Error,  Gone)
+        $(TROW $(DEPLINK Hexstring literals),                                     2.079, 2.079,  ,  )
         $(TROW $(DEPLINK Class allocators and deallocators),                      future,  ,  ,  )
         $(TROW $(DEPLINK Implicit comparison of different enums),                 2.075,  2.075,  ,  )
         $(TROW $(DEPLINK Implicit string concatenation),                          2.072,  2.072,  ,  )
@@ -59,6 +60,23 @@ $(SPEC_S Deprecated Features,
         $(DD The feature is completely gone)
     )
 
+$(H3 $(DEPNAME Hexstring literals))
+    $(P Hexstring literals can be used to enter literals in base 16.
+        ---
+        // deprecated code
+        // auto x = x"1234";
+        ---
+    )
+$(H4 Corrective Action)
+    $(P Use the $(REF hexString, std,conv) template.
+        ---
+        auto x = hexString!"1234";
+        ---
+    )
+$(H4 Rationale)
+    $(P Hexstrings are used so seldom that they don't warrant a language feature.
+    )
+
 $(H3 $(DEPNAME Class allocators and deallocators))
     $(P D classes can have members customizing the (de)allocation strategy.
         ---

spec/lex.dd

@@ -325,18 +325,6 @@ $(GNAME EscapeSequence):
     $(D \U) $(GLINK HexDigit) $(GLINK HexDigit) $(GLINK HexDigit) $(GLINK HexDigit) $(GLINK HexDigit) $(GLINK HexDigit) $(GLINK HexDigit) $(GLINK HexDigit)
     $(D \) $(GLINK2 entity, NamedCharacterEntity)
 
-$(GNAME HexString):
-    $(D x") $(GLINK HexStringChars) $(D ") $(GLINK StringPostfix)$(OPT)
-
-$(GNAME HexStringChars):
-    $(GLINK HexStringChar)
-    $(GLINK HexStringChar) $(I HexStringChars)
-
-$(GNAME HexStringChar):
-    $(GLINK HexDigit)
-    $(GLINK WhiteSpace)
-    $(GLINK EndOfLine)
-
 $(GNAME StringPostfix):
     $(B c)
     $(B w)
@@ -405,23 +393,6 @@ $(H3 $(LNAME2 double_quoted_strings, Double Quoted Strings))
          // 'a', 'b', and a linefeed
 ---------------
 
-
-
-$(H3 $(LNAME2 hex_strings, Hex Strings))
-
-        $(P Hex strings allow string literals to be created using hex data.
-        The hex data need not form valid UTF characters.
-        )
-
---------------
-x"0A"              // same as "\x0A"
-x"00 FBCD 32FD 0A" // same as
-                   // "\x00\xFB\xCD\x32\xFD\x0A"
---------------
-
-$(P Whitespace and newlines are ignored, so the hex data can be easily
-formatted. The number of hex characters must be a multiple of 2.)
-
 $(P Adjacent strings are concatenated with the ~ operator:)
 
 --------------
@@ -732,10 +703,6 @@ $(GNAME HexLetter):
         by a $(SINGLEQUOTE 0b) or $(SINGLEQUOTE 0B).
         )
 
-        $(P C-style octal integer notation was deemed too easy to mix up with decimal notation;
-        it is only fully supported in string literals.
-        D still supports octal integer literals interpreted at compile time through the $(REF octal, std,conv)
-        template, as in $(D octal!167).)
 
         $(P Hexadecimal integers are a sequence of hexadecimal digits preceded
         by a $(SINGLEQUOTE 0x) or $(SINGLEQUOTE 0X).