[antlr-interest] Re: Parse tree error messages.

[lgcraymer]

Trey--

This particular message says that you fell off of a tree--it found 
"null" when an AST was expected.  In general, it is hard to figure out 
what good error reporting would look like.  Try catching the exception 
in a debugger--I find that it helps to poke around to find context for 
the message.

--Loring


--- In antlr-interest at yahoogroups.com, "Trey Spiva" <Trey.Spiva at e...> 
wrote:
> When parsing a file the recognizers report pretty good error 
messages.
> However, when using parse trees the error messages are very cryptic. 
 Is
> here a way to have the tree parser at least report the token AST 
type
> that it is expecting and the AST type that if found.
> 
> The error message that the tree parser is reporting is:
> 
> <AST> : unexpected AST node: <ASTNULL>


 

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