Version 75.txr-75

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+                                     TXR 75
+                                   2014-01-16
+
+
+  Features
+  
+  - Two new stream functions: unget-char and unget-byte. Some streams now
+    support ungetting a byte or character, which was a glaring omission
+    in the API, without which some common scanning tasks are awkward.
+
+  - TXR Lisp functions with optional parameters can now specify expressions
+    to give those arguments values when the arguments are missing.
+
+  - New operators in TXR Lisp: append-each and append-each*.
+
+  - Change in the Lisp structure printer. The special structure generated by
+    the read syntax @sym and @(...) now prints back in the same syntax,
+    rather than as (sys:var sym) and (sys:expr ...).
+
+  Bugs
+
+  - Fix in put-byte function: before invoking the underlying operation,
+    it was testing whether the put-char operation exists for the stream,
+    rather than the put-byte operation. This would result in a crash if
+    the stream supports put-char but not put-byte.
+  
+  - Mistake in calculating bitmasks for regex character class ranges,
+    resulting in incorrect behavior for ranges whose upper range is
+    a character code corresponding to the last bit of a word in the
+    bitmask array, e.g. [A-\x7f], resulting in failures to match
+    32 or more characters in the upper end of the range.
+
+  - Missing documentation filled in for the functions throw, throwf and error.
+
+
+
                                      TXR 74
                                    2014-01-13