Update to syn 2.0

.deny.toml

@@ -15,7 +15,6 @@ multiple-versions = "warn"
 wildcards = "allow" # https://github.com/EmbarkStudios/cargo-deny/issues/488
 build.allow-build-scripts = [
     { name = "proc-macro2" },
-    { name = "syn" }, # TODO: update to 2.0
 ]
 
 # https://embarkstudios.github.io/cargo-deny/checks/licenses/cfg.html

.github/.cspell/project-dictionary.txt

@@ -1,4 +1,5 @@
 asyncness
 constness
 elems
+qself
 SUBPATTERN

Cargo.toml

@@ -30,4 +30,4 @@ clone-impls = ["syn/clone-impls"]
 [dependencies]
 proc-macro2 = { version = "1.0.60", default-features = false }
 quote = { version = "1", default-features = false }
-syn = { version = "1.0.44", default-features = false, features = ["parsing", "printing", "derive"] }
+syn = { version = "2", default-features = false, features = ["parsing", "printing", "derive"] }

examples/const_fn/Cargo.toml

@@ -10,5 +10,5 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1"
 quote = "1"
-syn = "1"
+syn = "2"
 syn-mid = { path = "../..", features = ["clone-impls"] }

examples/const_fn/tests/test.rs

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+use const_fn::const_fn;
+
+#[const_fn(any())]
+pub const fn a() {}
+#[const_fn(not(any()))]
+const fn b() {}
+
+pub static _B: () = b();