Re: This is a wrong code.I just want to know how it affect the
compiler,because the error message is quite strange.
On Oct 19, 12:26 pm, Erik Wikstr=F6m <Erik-wikst...@telia.com> wrote:
On 2008-10-19 12:04, Juha Nieminen wrote:
Erik Wikstr=F6m wrote:
As a rule, you can only trust the first error message a
compiler (any compiler) emits, all after might be the
result of the compiler being thrown of by the first error.
Which raises the question: Why do compilers bother with the
rest of the errors? Why not just stop with the first error?
Would you use such a compiler?
Because sometimes they are reliable and fixing more than one
error between recompiles is nice. After using a compiler for
some time you can generally tell which errors are due to
earlier errors and which are genuine errors.
Resynchronizing after an error is one of the most difficult
things in compiler construction; you want to absorb (and throw
out) enough input to avoid follow-up errors, but you don't want
to miss any real errors after the detected error. In this case,
the compiler was obviously not throwing out enough, keeping both
the partially parsed new expression, and the next token. In the
end, the only thing that stopped it was a hard wired maximum
number of errors. (Most compilers do this as well, as a safety
net. After all, what's the use of going on if the actual error
was that you fed an Ada program to the C++ compiler?)
James Kanze (GABI Software) email:email@example.com
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