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Fix Issue 21294 - Improve unhelpful error message with duplicate name… #23821

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thewilsonator merged 3 commits into from
Sep 12, 2026
+34 −4
Merged

Fix Issue 21294 - Improve unhelpful error message with duplicate name… #23821

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b60f504
Fix Issue 21294 - Improve unhelpful error message with duplicate name…
usefahmed07 Sep 9, 2026
c824e30
Report duplicate named-argument binding errors standalone
usefahmed07 Sep 10, 2026
2aa7ed0
Add Returns: section to checkNamedArgErrorAndReportOverload doc comment
usefahmed07 Sep 11, 2026
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1 change: 1 addition & 0 deletions compiler/src/dmd/funcsem.d
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Original file line number Diff line number Diff line change
Expand Up @@ -2177,6 +2177,7 @@ FuncDeclaration resolveFuncCall(Loc loc, Scope* sc, Dsymbol s,
{
eSink.error(loc, "none of the overloads of `%s` are callable using argument types `%s`",
fd.toErrMsg(), fargsBuf.peekChars());
checkNamedArgErrorAndReportOverload(fd, argumentList, loc);
printCandidates(loc, fd, sc.isDeprecated());
return null;
}
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22 changes: 22 additions & 0 deletions compiler/test/fail_compilation/issue21294.d
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@@ -0,0 +1,22 @@
/*
TEST_OUTPUT:
---
fail_compilation/issue21294.d(18): Error: none of the overloads of `fun` are callable using argument types `(int, int)`
fail_compilation/issue21294.d(18): parameter `a` assigned twice
fail_compilation/issue21294.d(13): Candidates are: `issue21294.fun(int a)`
fail_compilation/issue21294.d(14): `issue21294.fun(int a, int b)`
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usefahmed07 marked this conversation as resolved.
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---
*/

// https://github.com/dlang/dmd/issues/21294

void fun(int a) {}
void fun(int a, int b) {}

void main()
{
fun(
a: 2,
a: 4,
);
}
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