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This fixes issues with the same variable name being used in the same function for two different variables. (In some cases, one of the uses is a function argument.) The fix is in most cases to rename one or both of them. The individual choice depends on conventions in the surrounding code. Often, making both variable names more specific is the best choice. In a few cases, the fix is to move one of the variables to a lower scope, so that it no longer conflicts with the other. Since these are all local-variable conflicts, the changes in different files in this patch are independent of each other. These issues correspond to the gcc warning option -Wshadow=local, which is not currently used but could be activated after this. Reviewed-by: Peter Geoghegan <pg@bowt.ie> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/84b6f128-91f5-480e-8a9e-7d0e8f538cea%40eisentraut.org