http://d.puremagic.com/issues/show_bug.cgi?id=7557

           Summary: Sea of errors after template failure
           Product: D
           Version: D1 & D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: clugdbug@yahoo.com.au


--- Comment #0 from Don <clugdbug@yahoo.com.au> 2012-02-21 03:14:52 PST ---
Reported by bearophile.
More of a Sea++ of errors, it reminds me of Another Language.
It's because ScopeExp::semantic() doesn't use template instances if
global.errors is true.

Test case (not reduced, relies on D2 Phobos where writefln is a template):

import std.stdio;

T[] findroot(T)(in T x)
{
   writefln("xxx");
}

void main()
{
   findroot(1.0L);
}

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Vladimir Panteleev <thecybershadow@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thecybershadow@gmail.com


--- Comment #1 from Vladimir Panteleev <thecybershadow@gmail.com> 2012-02-21 09:26:43 PST ---
Is this the same problem where an error in one module causes errors in completely different modules (e.g. Phobos)?

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--- Comment #2 from Don <clugdbug@yahoo.com.au> 2012-02-21 11:55:31 PST ---
(In reply to comment #1)
> Is this the same problem where an error in one module causes errors in completely different modules (e.g. Phobos)?

I don't think so. This is one is very simple, it's not a module order
dependency, it's a failure to run semantic at all.
But, it'

Here is case b. Different symptoms, same root cause. The static assert should be triggered, despite the error in the enum declaration:
-------------

struct W
{
void blaz(T)() {static assert(0); }
}

void main()
{
  enum int blah = "abc";
  W m;
  m.blaz!(int)();
}

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--- Comment #3 from Vladimir Panteleev <thecybershadow@gmail.com> 2012-02-21 12:04:41 PST ---
OK. Here's the output of the problem I've encountered:

C:\Projects\DFeed\ae\demo\http> dbuild httpserve.d
C:\Projects\ae\sys\shutdown.d(24): Error: function
ae.sys.signals.addSignalHandler (int signum, void delegate() fn) is not
callable using argument types (int,void)
C:\Projects\ae\sys\shutdown.d(24): Error: cannot implicitly convert expression
(shutdown()) of type void to void delegate()

Above are correct errors (I forgot a &). The error messages below are unrelated to the above problems, and go away after I add the &.

C:\Soft\dmd2d\src\phobos\std\string.d(538): Error: expression isSomeChar!(char)
of type void does not have a boolean value
C:\Projects\ae\net\http\server.d(71): Error: template std.string.indexOf(Char)
if (isSomeChar!(Char)) does not match any function template declaration
C:\Projects\ae\net\http\server.d(71): Error: template std.string.indexOf(Char)
if (isSomeChar!(Char)) cannot deduce template function from argument types
!()(string,string
)
C:\Soft\dmd2d\src\phobos\std\string.d(448): Error: constraint isSomeChar!(char)
is not constant or does not evaluate to a bool
C:\Soft\dmd2d\src\phobos\std\string.d(612): Error: constraint isSomeChar!(char)
is not constant or does not evaluate to a bool
C:\Soft\dmd2d\src\phobos\std\algorithm.d(3893): Error: expression
isInputRange!(string) of type void does not have a boolean value
C:\Soft\dmd2d\src\phobos\std\algorithm.d(3963): Error: expression
isInputRange!(string) of type void does not have a boolean value
C:\Soft\dmd2d\src\phobos\std\algorithm.d(4015): Error: expression
isInputRange!(string) of type void does not have a boolean value
C:\Projects\ae\net\http\server.d(93): Error: template
std.algorithm.startsWith(alias pred = "a == b",Range,Ranges...) if
(isInputRange!(Range) && Ranges.length > 1 && is(t
ypeof(.startsWith!(pred)(doesThisStart,withOneOfThese[0])) : bool) &&
is(typeof(.startsWith!(pred)(doesThisStart,withOneOfThese[1..__dollar])) :
uint)) does not match any
function template declaration
C:\Projects\ae\net\http\server.d(93): Error: template
std.algorithm.startsWith(alias pred = "a == b",Range,Ranges...) if
(isInputRange!(Range) && Ranges.length > 1 && is(t
ypeof(.startsWith!(pred)(doesThisStart,withOneOfThese[0])) : bool) &&
is(typeof(.startsWith!(pred)(doesThisStart,withOneOfThese[1..__dollar])) :
uint)) cannot deduce templ
ate function from argument types !()(string,string)
C:\Soft\dmd2d\src\phobos\std\string.d(538): Error: expression isSomeChar!(char)
of type void does not have a boolean value
C:\Projects\ae\net\http\server.d(98): Error: template std.string.indexOf(Char)
if (isSomeChar!(Char)) does not match any function template declaration
C:\Projects\ae\net\http\server.d(98): Error: template std.string.indexOf(Char)
if (isSomeChar!(Char)) cannot deduce template function from argument types
!()(string,string
)
C:\Soft\dmd2d\src\phobos\std\conv.d(253): Error: constraint
isImplicitlyConvertible!(string,uint) is not constant or does not evaluate to a
bool
C:\Soft\dmd2d\src\phobos\std\conv.d(358): Error: constraint
isStaticArray!(string) is not constant or does not evaluate to a bool
C:\Soft\dmd2d\src\phobos\std\conv.d(450): Error: expression
isImplicitlyConvertible!(string,uint) of type void does not have a boolean
value
C:\Soft\dmd2d\src\phobos\std\conv.d(500): Error: expression
isImplicitlyConvertible!(string,uint) of type void does not have a boolean
value
C:\Soft\dmd2d\src\phobos\std\conv.d(572): Error: expression
isImplicitlyConvertible!(string,uint) of type void does not have a boolean
value
( ... 962 lines omitted ... )


I can't reproduce this right now, but should I try to reduce this problem if I encounter it again, or is this a known bug?

I remember seeing this issue a long time ago, but not recently - until a few days ago. So I think it was triggered by the "soldier on" change, like this bug.

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--- Comment #4 from github-bugzilla@puremagic.com 2012-02-21 15:41:47 PST ---
Commit pushed to dmd-1.x at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/36e214a3789c11d4102e53b63bf0f5283b0c6b67 fix Issue 7557 - Sea of errors after template failure

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla@digitalmars.com
         Resolution|                            |FIXED


--- Comment #5 from Walter Bright <bugzilla@digitalmars.com> 2012-02-21 15:42:17 PST ---
https://github.com/D-Programming-Language/dmd/pull/755

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