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Don't drop aggregate type qualifier for alias parameter #22393

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Merged
thewilsonator merged 1 commit into from
Jan 21, 2026
Merged

Don't drop aggregate type qualifier for alias parameter #22393

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4 changes: 3 additions & 1 deletion compiler/src/dmd/templatesem.d
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Original file line number Diff line number Diff line change
Expand Up @@ -2778,7 +2778,9 @@ private MATCH matchArg(TemplateParameter tp, Scope* sc, RootObject oarg, size_t
if (!sa || si != sa)
return matchArgNoMatch();
}
dedtypes[i] = sa;
// Note: Dsymbol can't have type qualifiers, so use type if it has them
// https://github.com/dlang/dmd/issues/17959
dedtypes[i] = ta && ta.mod ? ta : sa;

if (psparam)
{
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7 changes: 7 additions & 0 deletions compiler/test/compilable/alias_param_qual.d
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
alias t(alias a) = a;

static assert(is(t!(const Object) == const Object));
static assert(is(t!(shared(Object)) == shared Object));
static assert(is(t!(immutable S) == immutable(S)));

struct S {}
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