[Bug 29813] [xslt30] Errors in accumulators

https://www.w3.org/Bugs/Public/show_bug.cgi?id=29813

--- Comment #2 from Michael Kay <mike@saxonica.com> ---
Note one consequence of this rule: in test stream-203, a type error occurs
putting a value in a map while applying xsl:accumulator-rule/@select, and the
error is deferred until accumulator-before() is called. But this call occurs
while evaluating the predicate of a match pattern, which masks the error; so it
goes unreported, leading to difficulty in diagnostics.

(However, Saxon gives a warning when an error occurs matching a pattern, so all
is not lost.)

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