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Akim Demaille
2020-07-04 17:02:15 +02:00
parent d4ae66c371
commit 91e5a23ff2
1 changed files with 13 additions and 1 deletions
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14
NEWS
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@@ -2,6 +2,10 @@ GNU Bison NEWS
* Noteworthy changes in release ?.? (????-??-??) [?]
** Bug fixes
Portability issues.
* Noteworthy changes in release 3.6.90 (2020-07-04) [beta]
@@ -30,8 +34,11 @@ GNU Bison NEWS
First derivation exp ::=[ exp ::=[ exp '+' exp • ] '/' exp ]
Second derivation exp ::=[ exp '+' exp ::=[ exp • '/' exp ] ]
When Bison is installed with text styling enabled, the example is actually
shown twice, with colors highlighting the ambiguity.
This is a shift/reduce conflict caused by none of the operators having
precedence, so the example can be parsed in the two ways shown. When
precedence, so the example can be parsed in the two ways shown. When
bison cannot find an example that can be derived in two ways, it instead
generates two examples that are the same up until the dot:
@@ -43,6 +50,11 @@ GNU Bison NEWS
In these cases, the parser usually doesn't have enough lookahead to
differentiate the two given examples.
The counterexamples are "focused": in two different ways. First, they do
not clutter the output with all the derivations from the start symbol,
rather they start on the "conflicted nonterminal". They go straight to the
point. Second, they don't "expand" nonterminal symbols uselessly.
*** File prefix mapping
Contributed by Joshua Watt.