[antlr-interest] overlapping lexer rules

[cimbroken]

Hi everybody,
quoting two examples from the book (pg.280-281):

1)
INT : DIGIT+ ;
DIGIT : '0'..'9' ;

2)
INT : '0'..'9' +;
FLOAT : '0'..'9' + ('.' '0'..'9'*)? ;

I don't understand very well why the second is *not* a mistake. It seems to
me that this two examples are similar: 2 "free" rules (not fragment) that
try to match different tokens that start with the same character. Why antlr
treats them in different ways?

thanks!
teo
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