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Empty loops have no body which means this is a NULL_TREE during const evaluation which needs a check. Fixes Rust-GCC #3618. gcc/rust/ChangeLog: * backend/rust-constexpr.cc (eval_constant_expression): Check if t is a NULL_TREE gcc/testsuite/ChangeLog: * rust/compile/issue-3618.rs: Test empty loops error properly. Signed-off-by: Tom Schollenberger <tss2344@g.rit.edu>
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