invoke.texi: Update documentation of -Wshadow.
PR/44128 * gcc/doc/invoke.texi: Update documentation of -Wshadow. * gcc/cp/name-lookup.c (pushdecl_maybe_friend): Warn when a local decl (variable or type) shadows another type. * gcc/testsuite/g++.dg/warn/Wshadow-7.C: New test. From-SVN: r161765
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gcc/testsuite/g++.dg/warn/Wshadow-7.C
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