gccrs: Fix ICE accessing empty vector without check #2828
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Fixes #2747 gcc/rust/ChangeLog: * typecheck/rust-tyty-subst.cc (SubstitutionRef::get_mappings_from_generic_args): fix gcc/testsuite/ChangeLog: * rust/compile/issue-2747.rs: New test.
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Fixes #2747
gcc/rust/ChangeLog:
gcc/testsuite/ChangeLog: