Support root namespace in namespace attribute
diff --git a/syntax/qualified.rs b/syntax/qualified.rs
index 5eefb8d..96f07c1 100644
--- a/syntax/qualified.rs
+++ b/syntax/qualified.rs
@@ -10,14 +10,14 @@
pub fn parse_unquoted(input: ParseStream) -> Result<Self> {
let mut segments = Vec::new();
let mut trailing_punct = true;
- input.parse::<Option<Token![::]>>()?;
+ let leading_colons: Option<Token![::]> = input.parse()?;
while trailing_punct && input.peek(Ident::peek_any) {
let ident = Ident::parse_any(input)?;
segments.push(ident);
let colons: Option<Token![::]> = input.parse()?;
trailing_punct = colons.is_some();
}
- if segments.is_empty() {
+ if segments.is_empty() && leading_colons.is_none() {
return Err(input.error("expected path"));
} else if trailing_punct {
return Err(input.error("expected path segment"));
@@ -28,7 +28,12 @@
pub fn parse_quoted_or_unquoted(input: ParseStream) -> Result<Self> {
if input.peek(LitStr) {
let lit: LitStr = input.parse()?;
- lit.parse_with(Self::parse_unquoted)
+ if lit.value().is_empty() {
+ let segments = Vec::new();
+ Ok(QualifiedName { segments })
+ } else {
+ lit.parse_with(Self::parse_unquoted)
+ }
} else {
Self::parse_unquoted(input)
}
diff --git a/tests/ui/root_namespace.rs b/tests/ui/root_namespace.rs
new file mode 100644
index 0000000..886fbd9
--- /dev/null
+++ b/tests/ui/root_namespace.rs
@@ -0,0 +1,13 @@
+#[cxx::bridge]
+mod ffi {
+ #[namespace = "::"]
+ extern "Rust" {}
+
+ #[namespace = ""]
+ extern "Rust" {}
+
+ #[namespace = ]
+ extern "Rust" {}
+}
+
+fn main() {}
diff --git a/tests/ui/root_namespace.stderr b/tests/ui/root_namespace.stderr
new file mode 100644
index 0000000..ed07e66
--- /dev/null
+++ b/tests/ui/root_namespace.stderr
@@ -0,0 +1,5 @@
+error: unexpected token: `]`
+ --> $DIR/root_namespace.rs:9:19
+ |
+9 | #[namespace = ]
+ | ^
