Bug 8158 – std.algorithm.min fails to compile with user-defined types

This code import std.algorithm; import std.datetime; import std.stdio; void main() { writeln(min(Date(2012, 5, 7), Date(2011, 2, 9))); writeln(max(Date(2012, 5, 7), Date(2011, 2, 9))); } should print 2011-Feb-09 2012-May-07 Instead, it fails to compile with /home/jmdavis/dmd2/linux/bin/../../src/phobos/std/traits.d(4289): Error: incompatible types for ((min()) == (0)): 'Date' and 'int' /home/jmdavis/dmd2/linux/bin/../../src/phobos/std/traits.d(4289): Error: error evaluating static if expression /home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5035): Error: template instance std.traits.mostNegative!(Date) error instantiating /home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5055): Error: template instance std.algorithm.MinType!(Date,Date) error instantiating q.d(7): instantiated from here: min!(Date,Date,) q.d(7): Error: template instance std.algorithm.min!(Date,Date,) error instantiating or, if pull request #611 ( https://github.com/D-Programming-Language/phobos/pull/611 ) is pulled in, it fails to compile with /home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5035): Error: template instance mostNegative!(Date) mostNegative!(Date) does not match template declaration mostNegative(T) if (isNumeric!(T) || isSomeChar!(T)) /home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5035): Error: template instance mostNegative!(Date) mostNegative!(Date) does not match template declaration mostNegative(T) if (isNumeric!(T) || isSomeChar!(T)) /home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5037): Error: template instance mostNegative!(Date) mostNegative!(Date) does not match template declaration mostNegative(T) if (isNumeric!(T) || isSomeChar!(T)) /home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5037): Error: template instance mostNegative!(Date) mostNegative!(Date) does not match template declaration mostNegative(T) if (isNumeric!(T) || isSomeChar!(T)) /home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(5055): Error: template instance std.algorithm.MinType!(Date,Date) error instantiating q.d(7): instantiated from here: min!(Date,Date,) q.d(7): Error: template instance std.algorithm.min!(Date,Date,) error instantiating In either case, the std.algorithm.min is failing to compile. max actually works if you comment out the call to min, but min is broken.

Commits pushed to master at https://github.com/D-Programming-Language/phobos https://github.com/D-Programming-Language/phobos/commit/adb31e7048d1b8e9661be0508b515a0887d98809 Fix for issue# 8158. https://github.com/D-Programming-Language/phobos/commit/6048cafc58c722957dc21e94eb47f7046a1a5ff7 Merge pull request #612 from jmdavis/min Fix for issue# 8158.

Commit pushed to master at https://github.com/D-Programming-Language/phobos https://github.com/D-Programming-Language/phobos/commit/6499322e8937dd987d069f7738a2540ac3c6b022 Added fix for issue# 8158 to changelog.