`Method invocations are not yet supported within XML navigation expressions` error is emitted when xml navigation expression is used as a argument of a function invocatin.

[rdhananjaya]

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Description:

public function main() {
    xml c = xml `<elem>hello</elem>`;
    xml x = 'xml:concat(c/*, "h");
}

Out:

ERROR [main.bal:(4:13,4:34)] method invocations are not yet supported within XML navigation expressions, use a grouping expression (parenthesis) if you intend to invoke the method on the result of the navigation expression.

Workaround is to wrapping the XML navigation expression within parenthesis. Steps to reproduce:

Affected Versions: SLP8 OS, DB, other environment details and versions:

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