[Issue 5595] Compiler crash on heavy std.algorithm use

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5595



--- Comment #2 from Don <clugdbug at yahoo.com.au> 2011-02-16 08:28:43 PST ---
The regression was caused by a Phobos change, which has triggered a compiler
segfault in interpret.c.
In attempting to instantiate map!(to), 'to' is a symbol with no identifier.
(.ident is NULL).
The segfault can be prevented in dsymbol.c, line 70, by checking for a null
identifier. But without knowing why we're getting a null identifier, I can't
recommend this as a valid patch.

int Dsymbol::equals(Object *o)
{   Dsymbol *s;

    if (this == o)
        return TRUE;
    s = (Dsymbol *)(o);
-    if (s && ident->equals(s->ident))
+    if (s && s->ident && ident->equals(s->ident))
        return TRUE;
    return FALSE;
}

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