Adds '&' as an abbreviation for ADR().

Author: dmsc

manual.md

@@ -830,13 +830,15 @@ level" because they interact directly
 with the hardware. Use with care!
 
 
-- ADR(_arr_) :
+- ADR(_arr_) / &_arr_ :
   Returns the address of the first
   element of _arr_ in memory.
   Following elements of the array
   occupy adjacent memory locations.
+  Instead of `ADR(X)` you can simply
+  type `&X`.
 
-- ADR(_str_) :
+- ADR(_str_) / &_str_ :
   Returns the address of the _string_
   in memory.  The first memory location
   contains the length of the string,

src/basic.syn

@@ -224,6 +224,7 @@ T_EXPR: integer constant, variable or function
         "Dpeek"  T_EXPR emit TOK_DPEEK
         "USR("   EXPR emit TOK_USR_ADDR USR_EXPR_MORE ")" emit TOK_USR_CALL
         "ADR("   ADR_EXPR ")"
+        "&"      ADR_EXPR
         "Len"    STR_PAR_EXPR emit TOK_PEEK # First byte of string is the length
         "Val"    STR_PAR_EXPR emit TOK_VAL
         "ASc"    STR_PAR_EXPR emit { TOK_PUSH_1, TOK_ADD, TOK_PEEK } # TODO: does not check for empty strings.