Move make_unclosed_delims_error to lexer/diagonostics.rs

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>

compiler/rustc_parse/src/lib.rs

@@ -32,7 +32,7 @@ pub const MACRO_ARGUMENTS: Option<&str> = Some("macro arguments");
 
 #[macro_use]
 pub mod parser;
-use parser::{Parser, make_unclosed_delims_error};
+use parser::Parser;
 pub mod lexer;
 pub mod validate_attr;