attr: remove dep on ExtCtxt

4 files changed, 17 insertions, 2 deletions

diff --git a/src/libsyntax_ext/global_allocator.rs b/src/libsyntax_ext/global_allocator.rs
index cd2a9b61a76..f014b4f4f9f 100644
--- a/src/libsyntax_ext/global_allocator.rs
+++ b/src/libsyntax_ext/global_allocator.rs
@@ -1,6 +1,7 @@
+use crate::util::check_builtin_macro_attribute;
+
 use syntax::ast::{ItemKind, Mutability, Stmt, Ty, TyKind, Unsafety};
 use syntax::ast::{self, Param, Attribute, Expr, FnHeader, Generics, Ident};
-use syntax::attr::check_builtin_macro_attribute;
 use syntax::ext::allocator::{AllocatorKind, AllocatorMethod, AllocatorTy, ALLOCATOR_METHODS};
 use syntax::ext::base::{Annotatable, ExtCtxt};
 use syntax::ptr::P;
diff --git a/src/libsyntax_ext/lib.rs b/src/libsyntax_ext/lib.rs
index 64d46a84cba..5ba76a52350 100644
--- a/src/libsyntax_ext/lib.rs
+++ b/src/libsyntax_ext/lib.rs
@@ -37,6 +37,7 @@ mod log_syntax;
 mod source_util;
 mod test;
 mod trace_macros;
+mod util;
 
 pub mod cmdline_attrs;
 pub mod plugin_macro_defs;
diff --git a/src/libsyntax_ext/test.rs b/src/libsyntax_ext/test.rs
index d4638c45473..4d7441ca0b6 100644
--- a/src/libsyntax_ext/test.rs
+++ b/src/libsyntax_ext/test.rs
@@ -1,8 +1,10 @@
 /// The expansion from a test function to the appropriate test struct for libtest
 /// Ideally, this code would be in libtest but for efficiency and error messages it lives here.
 
+use crate::util::check_builtin_macro_attribute;
+
 use syntax::ast;
-use syntax::attr::{self, check_builtin_macro_attribute};
+use syntax::attr;
 use syntax::ext::base::*;
 use syntax::print::pprust;
 use syntax::source_map::respan;
diff --git a/src/libsyntax_ext/util.rs b/src/libsyntax_ext/util.rs
new file mode 100644
index 00000000000..fbae68057c5
--- /dev/null
+++ b/src/libsyntax_ext/util.rs
@@ -0,0 +1,11 @@
+use syntax_pos::Symbol;
+use syntax::ast::MetaItem;
+use syntax::attr::{check_builtin_attribute, AttributeTemplate};
+use syntax::ext::base::ExtCtxt;
+
+pub fn check_builtin_macro_attribute(ecx: &ExtCtxt<'_>, meta_item: &MetaItem, name: Symbol) {
+    // All the built-in macro attributes are "words" at the moment.
+    let template = AttributeTemplate::only_word();
+    let attr = ecx.attribute(meta_item.clone());
+    check_builtin_attribute(ecx.parse_sess, &attr, name, template);
+}