Bug 19442 – multiple argument string mixin dont support char literals

Since dmd 2.083.0, Issue 19292, string mixins can accept multiple arguments. This sometimes does not work as expected. First, passing character literals gives a confusing error message: enum x1 = 1; pragma(msg, mixin('x',1)); // Error: incomplete mixin expression `'x'1` pragma(msg, mixin("x",1)); // OK, outputs 1 Second, passing a template parameter list does not expand the arguments: enum x1 = 1; enum makeIdent(args...) = mixin(args); pragma(msg, makeIdent!("x", 1)); // Error: undefined identifier `tuple` // Using this works but only for two arguments enum makeIdent(args...) = mixin(args[0], args[1]); pragma(msg, makeIdent!("x", 1)); // Output: 1 Here's the real code I was working on (like compile-time std.conv.text but probably more efficient): enum ctText(args...) = mixin("`", args, "`"); pragma(msg, ctText!(5, " bottles")); // Output: tuple(5, " bottles") Above, args is not implicitly expanded. // This works but only for two arguments enum ctText(args...) = mixin("`", args[0], args[1], "`"); static assert(ctText!(5, " bottles") == "5 bottles");

Can you open a separate issue for the second case please ?

@Basile-z created dlang/dmd pull request #9491 "fix issue 19442 - multiple argument string mixin dont support char literals" fixing this issue: - fix issue 19442 - multiple argument string mixin dont support char literals https://github.com/dlang/dmd/pull/9491

Second bug is now there https://issues.dlang.org/show_bug.cgi?id=19775

dlang/dmd pull request #9491 "fix issue 19442 - multiple argument string mixin dont support char literals" was merged into master: - 6ec4724c9da3cbefe16a2bc462fbbfd0309caff5 by Basile Burg: fix issue 19442 - multiple argument string mixin dont support char literals https://github.com/dlang/dmd/pull/9491