diff --git a/mlir/examples/toy/Ch1/include/toy/Parser.h b/mlir/examples/toy/Ch1/include/toy/Parser.h
--- a/mlir/examples/toy/Ch1/include/toy/Parser.h
+++ b/mlir/examples/toy/Ch1/include/toy/Parser.h
@@ -428,7 +428,7 @@
       } while (true);
     }
     if (lexer.getCurToken() != ')')
-      return parseError<PrototypeAST>("}", "to end function prototype");
+      return parseError<PrototypeAST>(")", "to end function prototype");
 
     // success.
     lexer.consume(Token(')'));
diff --git a/mlir/examples/toy/Ch2/include/toy/Parser.h b/mlir/examples/toy/Ch2/include/toy/Parser.h
--- a/mlir/examples/toy/Ch2/include/toy/Parser.h
+++ b/mlir/examples/toy/Ch2/include/toy/Parser.h
@@ -428,7 +428,7 @@
       } while (true);
     }
     if (lexer.getCurToken() != ')')
-      return parseError<PrototypeAST>("}", "to end function prototype");
+      return parseError<PrototypeAST>(")", "to end function prototype");
 
     // success.
     lexer.consume(Token(')'));
diff --git a/mlir/examples/toy/Ch3/include/toy/Parser.h b/mlir/examples/toy/Ch3/include/toy/Parser.h
--- a/mlir/examples/toy/Ch3/include/toy/Parser.h
+++ b/mlir/examples/toy/Ch3/include/toy/Parser.h
@@ -428,7 +428,7 @@
       } while (true);
     }
     if (lexer.getCurToken() != ')')
-      return parseError<PrototypeAST>("}", "to end function prototype");
+      return parseError<PrototypeAST>(")", "to end function prototype");
 
     // success.
     lexer.consume(Token(')'));
diff --git a/mlir/examples/toy/Ch4/include/toy/Parser.h b/mlir/examples/toy/Ch4/include/toy/Parser.h
--- a/mlir/examples/toy/Ch4/include/toy/Parser.h
+++ b/mlir/examples/toy/Ch4/include/toy/Parser.h
@@ -428,7 +428,7 @@
       } while (true);
     }
     if (lexer.getCurToken() != ')')
-      return parseError<PrototypeAST>("}", "to end function prototype");
+      return parseError<PrototypeAST>(")", "to end function prototype");
 
     // success.
     lexer.consume(Token(')'));
diff --git a/mlir/examples/toy/Ch5/include/toy/Parser.h b/mlir/examples/toy/Ch5/include/toy/Parser.h
--- a/mlir/examples/toy/Ch5/include/toy/Parser.h
+++ b/mlir/examples/toy/Ch5/include/toy/Parser.h
@@ -428,7 +428,7 @@
       } while (true);
     }
     if (lexer.getCurToken() != ')')
-      return parseError<PrototypeAST>("}", "to end function prototype");
+      return parseError<PrototypeAST>(")", "to end function prototype");
 
     // success.
     lexer.consume(Token(')'));
diff --git a/mlir/examples/toy/Ch6/include/toy/Parser.h b/mlir/examples/toy/Ch6/include/toy/Parser.h
--- a/mlir/examples/toy/Ch6/include/toy/Parser.h
+++ b/mlir/examples/toy/Ch6/include/toy/Parser.h
@@ -428,7 +428,7 @@
       } while (true);
     }
     if (lexer.getCurToken() != ')')
-      return parseError<PrototypeAST>("}", "to end function prototype");
+      return parseError<PrototypeAST>(")", "to end function prototype");
 
     // success.
     lexer.consume(Token(')'));
diff --git a/mlir/examples/toy/Ch7/include/toy/Parser.h b/mlir/examples/toy/Ch7/include/toy/Parser.h
--- a/mlir/examples/toy/Ch7/include/toy/Parser.h
+++ b/mlir/examples/toy/Ch7/include/toy/Parser.h
@@ -583,7 +583,7 @@
       } while (true);
     }
     if (lexer.getCurToken() != ')')
-      return parseError<PrototypeAST>("}", "to end function prototype");
+      return parseError<PrototypeAST>(")", "to end function prototype");
 
     // success.
     lexer.consume(Token(')'));