[Issue 4910] New: [CTFE] Cannot evaluate a function that has failed at once

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4910

           Summary: [CTFE] Cannot evaluate a function that has failed at
                    once
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: rsinfu at gmail.com


--- Comment #0 from Shin Fujishiro <rsinfu at gmail.com> 2010-09-21 15:33:40 PDT ---
If the interpretor failed to evaluate a function with an invalid argument at
once, then it fails to evaluate the same function with a valid argument.

The following code fails (it should succeed):
-------------------- test1.d
int echo(int a)
{
    return a;
}

template ctfe(int v) { }
static int var;
static assert(!__traits(compiles, ctfe!(echo(var)) ));

enum c = echo(123); // (10)
--------------------
% dmd -o- -c test1.d
test1.d(10): Error: cannot evaluate echo(123) at compile time
test1.d(10): Error: cannot evaluate echo(123) at compile time
--------------------

But it succeeds if echo(123) is evaluated before the failure.
-------------------- test2.d
int echo(int a)
{
    return a;
}

enum c = echo(123);

template ctfe(int v) { }
static int var;
static assert(!__traits(compiles, ctfe!(echo(var)) ));
--------------------
% dmd -o- -c test2.d
% _
--------------------

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