[Issue 10438] New: Improve template deduction error message
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Fri Jun 21 08:18:12 PDT 2013
http://d.puremagic.com/issues/show_bug.cgi?id=10438
Summary: Improve template deduction error message
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: nobody at puremagic.com
ReportedBy: jlquinn at optonline.net
--- Comment #0 from Jerry Quinn <jlquinn at optonline.net> 2013-06-21 08:18:11 PDT ---
import std.array;
void main() {
auto app = appender!char();
}
/home/jlquinn/dmd2/linux/bin64/dmd junk.d
junk.d(3): Error: template std.array.appender does not match any function
template declaration. Candidates are:
/home/jlquinn/dmd2/linux/bin64/../../src/phobos/std/array.d(2502):
std.array.appender(A : E[], E)(A array = null)
/home/jlquinn/dmd2/linux/bin64/../../src/phobos/std/array.d(2611):
std.array.appender(A : E[]*, E)(A array)
/home/jlquinn/dmd2/linux/bin64/../../src/phobos/std/array.d(2502): Error:
template std.array.appender cannot deduce template function from argument types
!(char)()
junk.d(3): Error: template instance appender!(char) errors instantiating
template
It took a little puzzling for me to figure out what was wrong (I know an
experienced D dev wouldn't have trouble). In this case, I'd love to see a
message describing why a template alternative doesn't match. For example,
something like:
/home/jlquinn/dmd2/linux/bin64/../../src/phobos/std/array.d(2502):
std.array.appender(A : E[], E)(A array = null)
no match because char is not an array slice
This is clearly an enhancement, but info like this would go a long way towards
speeding up the ability to figure out why template heavy code isn't compiling.
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