bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/hir-def/src/macro_expansion_tests/mbe/metavar_expr.rs')
-rw-r--r--crates/hir-def/src/macro_expansion_tests/mbe/metavar_expr.rs91
1 files changed, 91 insertions, 0 deletions
diff --git a/crates/hir-def/src/macro_expansion_tests/mbe/metavar_expr.rs b/crates/hir-def/src/macro_expansion_tests/mbe/metavar_expr.rs
new file mode 100644
index 0000000000..ae138529ea
--- /dev/null
+++ b/crates/hir-def/src/macro_expansion_tests/mbe/metavar_expr.rs
@@ -0,0 +1,91 @@
+//! Tests for RFC 3086 metavariable expressions.
+
+use expect_test::expect;
+
+use crate::macro_expansion_tests::check;
+
+#[test]
+fn test_dollar_dollar() {
+ check(
+ r#"
+macro_rules! register_struct { ($Struct:ident) => {
+ macro_rules! register_methods { ($$($method:ident),*) => {
+ macro_rules! implement_methods { ($$$$($$val:expr),*) => {
+ struct $Struct;
+ impl $Struct { $$(fn $method() -> &'static [u32] { &[$$$$($$$$val),*] })*}
+ }}
+ }}
+}}
+
+register_struct!(Foo);
+register_methods!(alpha, beta);
+implement_methods!(1, 2, 3);
+"#,
+ expect![[r#"
+macro_rules! register_struct { ($Struct:ident) => {
+ macro_rules! register_methods { ($$($method:ident),*) => {
+ macro_rules! implement_methods { ($$$$($$val:expr),*) => {
+ struct $Struct;
+ impl $Struct { $$(fn $method() -> &'static [u32] { &[$$$$($$$$val),*] })*}
+ }}
+ }}
+}}
+
+macro_rules !register_methods {
+ ($($method: ident), *) = > {
+ macro_rules!implement_methods {
+ ($$($val: expr), *) = > {
+ struct Foo;
+ impl Foo {
+ $(fn $method()-> &'static[u32] {
+ &[$$($$val), *]
+ }
+ )*
+ }
+ }
+ }
+ }
+}
+macro_rules !implement_methods {
+ ($($val: expr), *) = > {
+ struct Foo;
+ impl Foo {
+ fn alpha()-> &'static[u32] {
+ &[$($val), *]
+ }
+ fn beta()-> &'static[u32] {
+ &[$($val), *]
+ }
+ }
+ }
+}
+struct Foo;
+impl Foo {
+ fn alpha() -> &'static[u32] {
+ &[1, 2, 3]
+ }
+ fn beta() -> &'static[u32] {
+ &[1, 2, 3]
+ }
+}
+"#]],
+ )
+}
+
+#[test]
+fn test_metavar_exprs() {
+ check(
+ r#"
+macro_rules! m {
+ ( $( $t:tt )* ) => ( $( ${ignore(t)} -${index()} )-* );
+}
+const _: i32 = m!(a b c);
+ "#,
+ expect![[r#"
+macro_rules! m {
+ ( $( $t:tt )* ) => ( $( ${ignore(t)} -${index()} )-* );
+}
+const _: i32 = -0--1--2;
+ "#]],
+ );
+}