Protect from errors in alternate pattern parsing #4169
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Fixes Rust-GCC#4155. gcc/rust/ChangeLog: * parse/rust-parse-impl.h (Parser::parse_pattern): Ignore inner patterns which fail to parse. gcc/testsuite/ChangeLog: * rust/compile/issue-4155.rs: New test. Signed-off-by: Owen Avery <[email protected]>
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Fixes #4155