parse: test bad variants wrt. issue 48137.

Author: Centril

src/test/ui/parser/issue-48137-macros-cannot-interpolate-impl-items-bad-variants.rs

@@ -0,0 +1,44 @@
+fn main() {}
+
+macro_rules! expand_to_enum {
+    () => {
+        enum BadE {}
+        //~^ ERROR enum is not supported in `trait`s or `impl`s
+        //~| ERROR enum is not supported in `trait`s or `impl`s
+        //~| ERROR enum is not supported in `extern` blocks
+    };
+}
+
+macro_rules! mac_impl {
+    ($($i:item)*) => {
+        struct S;
+        impl S { $($i)* }
+    }
+}
+
+mac_impl! {
+    struct BadS; //~ ERROR struct is not supported in `trait`s or `impl`s
+    expand_to_enum!();
+}
+
+macro_rules! mac_trait {
+    ($($i:item)*) => {
+        trait T { $($i)* }
+    }
+}
+
+mac_trait! {
+    struct BadS; //~ ERROR struct is not supported in `trait`s or `impl`s
+    expand_to_enum!();
+}
+
+macro_rules! mac_extern {
+    ($($i:item)*) => {
+        extern "C" { $($i)* }
+    }
+}
+
+mac_extern! {
+    struct BadS; //~ ERROR struct is not supported in `extern` blocks
+    expand_to_enum!();
+}

src/test/ui/parser/issue-48137-macros-cannot-interpolate-impl-items-bad-variants.stderr

@@ -0,0 +1,53 @@
+error: struct is not supported in `trait`s or `impl`s
+  --> $DIR/issue-48137-macros-cannot-interpolate-impl-items-bad-variants.rs:20:5
+   |
+LL |     struct BadS;
+   |     ^^^^^^^^^^^^
+
+error: enum is not supported in `trait`s or `impl`s
+  --> $DIR/issue-48137-macros-cannot-interpolate-impl-items-bad-variants.rs:5:9
+   |
+LL |         enum BadE {}
+   |         ^^^^^^^^^
+...
+LL |     expand_to_enum!();
+   |     ------------------ in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: struct is not supported in `trait`s or `impl`s
+  --> $DIR/issue-48137-macros-cannot-interpolate-impl-items-bad-variants.rs:31:5
+   |
+LL |     struct BadS;
+   |     ^^^^^^^^^^^^
+
+error: enum is not supported in `trait`s or `impl`s
+  --> $DIR/issue-48137-macros-cannot-interpolate-impl-items-bad-variants.rs:5:9
+   |
+LL |         enum BadE {}
+   |         ^^^^^^^^^
+...
+LL |     expand_to_enum!();
+   |     ------------------ in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: struct is not supported in `extern` blocks
+  --> $DIR/issue-48137-macros-cannot-interpolate-impl-items-bad-variants.rs:42:5
+   |
+LL |     struct BadS;
+   |     ^^^^^^^^^^^^
+
+error: enum is not supported in `extern` blocks
+  --> $DIR/issue-48137-macros-cannot-interpolate-impl-items-bad-variants.rs:5:9
+   |
+LL |         enum BadE {}
+   |         ^^^^^^^^^
+...
+LL |     expand_to_enum!();
+   |     ------------------ in this macro invocation
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 6 previous errors
+