llvm-project

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// RUN: not mlir-opt -allow-unregistered-dialect %s -split-input-file -verify-diagnostics 2>&1 | FileCheck %s
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// CHECK: found start of regex with no end '}}'
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// expected-error-re {{{{}}
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// -----
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// CHECK: invalid regex: parentheses not balanced
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// expected-error-re {{ {{(}} }}
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// -----
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func.func @foo() -> i32 {
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  // expected-error-re@+1 {{'func.return' op has 0 operands, but enclosing function (@{{.*}}) returns 1}}
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  return
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}
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