Improve assertion violation message (#22522)
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@ -297,7 +297,7 @@ namespace ts {
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case SyntaxKind.Parameter:
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// Parameters with names are handled at the top of this function. Parameters
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// without names can only come from JSDocFunctionTypes.
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Debug.assert(node.parent.kind === SyntaxKind.JSDocFunctionType);
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Debug.assert(node.parent.kind === SyntaxKind.JSDocFunctionType, "Impossible parameter parent kind", () => `parent is: ${(ts as any).SyntaxKind ? (ts as any).SyntaxKind[node.parent.kind] : node.parent.kind}, expected JSDocFunctionType`);
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const functionType = <JSDocFunctionType>node.parent;
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const index = functionType.parameters.indexOf(node as ParameterDeclaration);
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return "arg" + index as __String;
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