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Accept positional-only arguments syntax #2001

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Merged
slozier merged 1 commit into from
Feb 22, 2026
Merged

Accept positional-only arguments syntax #2001

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10 changes: 9 additions & 1 deletion src/core/IronPython/Compiler/Parser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1201,6 +1201,7 @@ private Parameter[] ParseParameterList(TokenKind terminator, bool allowAnnotatio
HashSet<string> names = new HashSet<string>(StringComparer.Ordinal);
bool needDefault = false;
bool readMultiply = false;
bool readTrueDivide = false;
bool hasKeywordOnlyParameter = false;
// we want these to be the last two parameters
Parameter listParameter = null;
Expand All @@ -1221,7 +1222,14 @@ private Parameter[] ParseParameterList(TokenKind terminator, bool allowAnnotatio
break;
}

if (MaybeEat(TokenKind.Multiply)) {
if (MaybeEat(TokenKind.TrueDivide)) { // accept syntax for positional-only parameters from Python 3.8
if (position == 0 || readMultiply || readTrueDivide) {
ReportSyntaxError(_lookahead);
return null;
}

readTrueDivide = true;
} else if (MaybeEat(TokenKind.Multiply)) {
if (readMultiply) {
ReportSyntaxError(_lookahead);
return null;
Expand Down