适配syn升级至2.0

Signed-off-by: 徐未来 <xuweilai2@huawei.com>

bindgen/Cargo.toml

@@ -32,7 +32,7 @@ lazycell = "1"
 lazy_static = "1"
 peeking_take_while = "0.1.2"
 quote = { version = "1", default-features = false }
-syn = { version = "1.0.99", features = ["full", "extra-traits", "visit-mut"]}
+syn = { version = "2.0", features = ["full", "extra-traits", "visit-mut"]}
 regex = { version = "1.5", default-features = false , features = ["std", "unicode"] }
 which = { version = "4.2.1", optional = true, default-features = false }
 shlex = "1"

bindgen/codegen/postprocessing/merge_extern_blocks.rs

@@ -20,6 +20,7 @@ impl VisitMut for Visitor {
                     attrs,
                     abi,
                     brace_token,
+                    unsafety,
                     items: extern_block_items,
                 }) = item
                 {
@@ -45,6 +46,7 @@ impl VisitMut for Visitor {
                             attrs,
                             abi,
                             brace_token,
+                            unsafety,
                             items: extern_block_items,
                         });
                     }

bindgen/codegen/postprocessing/sort_semantically.rs

@@ -29,7 +29,6 @@ impl VisitMut for Visitor {
                 Item::ExternCrate(_) => 13,
                 Item::ForeignMod(_) => 14,
                 Item::Macro(_) => 15,
-                Item::Macro2(_) => 16,
                 _ => 18,
             });
         }