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1; RUN: not --crash llc -mtriple=x86_64-linux-gnu %s -o - 2>&1 | FileCheck %s2 3; CHECK: LLVM ERROR: failed to perform tail call elimination on a call site marked musttail4declare tailcc [16 x i64] @callee()5define tailcc [16 x i64] @caller() {6 %res = musttail call tailcc [16 x i64] @callee()7 ret [16 x i64] %res8}9