Add computation-expression tests for warning 20 range#19992
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…19896) Answers @auduchinok's open question on PR #19896: in a computation expression the loop body is desugared per-statement, so the trailing expression reaches TcStmt on its own and warning 20 highlights only the offending expression (e.g. 'x'), same as the non-CE case. - async CE: asserts the squiggle lands on 'x' alone (Line 6, Col 13-14). - seq CE: trailing non-unit value is an implicit yield, so no warning 20. The CE test originally requested in review was removed in 0127569; this reinstates a genuine CE case plus the seq implicit-yield contrast. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Test-only follow-up to #19896, adding the computation-expression coverage requested in review.
Inside a CE the loop body is desugared per-statement, so the trailing expression reaches
TcStmton its own and warning 20 highlights only the offending expression.async/taskwarn on the value alone;seqtreats it as an implicit yield, so it doesn't warn at all.