February 24, 2012
http://d.puremagic.com/issues/show_bug.cgi?id=7570

           Summary: No true error message in one CTFE
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2012-02-24 05:05:19 PST ---
This may be wrong D2 code, if DMD is not able to run it at compile-time:


bool not_end(const char *s, const int n) {
    return s && s[n];
}
bool str_prefix(const char *s, const char *t, const int ns, const int nt) {
    return (s == t) || !*(t + nt) || (*(s + ns) == *(t + nt) && (str_prefix(s,
t, ns+1, nt+1)));
}
bool contains(const char *s, const char *needle, const int n=0) {
    return not_end(s, n) && (str_prefix(s, needle, n, 0) || contains(s, needle,
n+1));
}
enum int x = contains("froogler", "oogle");
void main() {}



DMD 2.059head gives no true error message, just some "called from here":

bug.d(8):        called from here: str_prefix(s,needle,n,0)
bug.d(10):        called from here: contains("froogler","oogle",0)
bug.d(8):        called from here: str_prefix(s,needle,n,0)
bug.d(10):        called from here: contains("froogler","oogle",0)
bug.d(8):        called from here: str_prefix(s,needle,n,0)
bug.d(10):        called from here: contains("froogler","oogle",0)

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February 24, 2012
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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |CTFE, rejects-valid
                 CC|                            |yebblies@gmail.com
           Platform|x86                         |All
            Version|D2                          |D1 & D2
         AssignedTo|nobody@puremagic.com        |clugdbug@yahoo.com.au
            Summary|No true error message in    |Missing error in ctfe for
                   |one CTFE                    |dereferencing a pointer
                   |                            |passed as a parameter
         OS/Version|Windows                     |All


--- Comment #1 from yebblies <yebblies@gmail.com> 2012-02-25 00:43:47 EST ---
The interpreter can't seem to handle '!*(t + nt)', as constfold.c's Ptr only handles TOKaddress + TOKint64, and it resolves to TOKvar + TOKint64, and PtrExp::interpret doesn't handle the case where Ptr fails.

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--- Comment #2 from Don <clugdbug@yahoo.com.au> 2012-03-02 06:20:59 PST ---
Reduced test case:
========================================
bool contains(const char *s) {
    return *(s + 0) == 'a';
}
static assert(!contains("froogler"));

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--- Comment #3 from yebblies <yebblies@gmail.com> 2013-01-17 02:11:46 EST ---
Now fails with:
DMD v2.062 DEBUG
testx.d(4):        called from here: contains("froogler")
testx.d(4): Error: static assert  (!contains("froogler")) is not evaluatable at
compile time

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bearophile_hugs@eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|diagnostic                  |


--- Comment #4 from bearophile_hugs@eml.cc 2013-01-16 10:08:45 PST ---
I remove the diagnostic tag because the diagnostic now seems acceptable.

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