Count a for-range loop variable's start expression as a read - #1301
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…ead write in the body still warns.
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for i = a downto 0reported "The assignment to local variable a is never read" for the precedinglet a = 10, because the dataflow analysis only inspects a compound statement's directExprchildren, and a for-range loop's start expression belongs to the loop variable'sLocalVarDefrather than to the loop statement itself — so the read was never recorded. The same workaround already existed forSwitchStmt, whose expressions are likewise not direct children.