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c7bac6f2e6
e350c357 (#40228) introduced a subtle bug: it switched the flags to an alias, dropping `SymbolFlags.Property` --- and that makes `symbolIsValue()` get to the `resolveAlias(symbol)` call, which leads to `getPropertyOfType()` with`resolved.callSignatures`+`constructSignatures` being `undefined`. So initialize them in `setStructuredTypeMembers` before calling `getNamedMembers()`. Fixes #42350