[gcc/devel/rust/master] gccrs: Fix ICE when using super mid way though path

[Thomas Schwinge]

https://gcc.gnu.org/g:34b0a681598d52de442a0a21c3a7df20bf1485bc

commit 34b0a681598d52de442a0a21c3a7df20bf1485bc
Author: Philip Herron <herron.philip@googlemail.com>
Date:   Wed Mar 26 17:26:12 2025 +0000

    gccrs: Fix ICE when using super mid way though path
    
    Fixes Rust-GCC#3568
    
    gcc/rust/ChangeLog:
    
            * resolve/rust-ast-resolve-path.cc (ResolvePath::resolve_path): check for super mid path
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/nr2/exclude: nr2 puts out a different error multiple times
            * rust/compile/issue-3568.rs: New test.
    
    Signed-off-by: Philip Herron <herron.philip@googlemail.com>

Diff:
---
 gcc/rust/resolve/rust-ast-resolve-path.cc | 6 ++++++
 gcc/testsuite/rust/compile/issue-3568.rs  | 7 +++++++
 gcc/testsuite/rust/compile/nr2/exclude    | 1 +
 3 files changed, 14 insertions(+)

diff --git a/gcc/rust/resolve/rust-ast-resolve-path.cc b/gcc/rust/resolve/rust-ast-resolve-path.cc
index b2b10719e190..530926d5d97a 100644
--- a/gcc/rust/resolve/rust-ast-resolve-path.cc
+++ b/gcc/rust/resolve/rust-ast-resolve-path.cc
@@ -370,6 +370,12 @@ ResolvePath::resolve_path (AST::SimplePath &expr)
 	}
       else if (segment.is_super_path_seg ())
 	{
+	  if (!is_first_segment)
+	    {
+	      rust_error_at (segment.get_locus (),
+			     "%<super%> can only be used in start position");
+	      return UNKNOWN_NODEID;
+	    }
 	  if (module_scope_id == crate_scope_id)
 	    {
 	      rust_error_at (segment.get_locus (),
diff --git a/gcc/testsuite/rust/compile/issue-3568.rs b/gcc/testsuite/rust/compile/issue-3568.rs
new file mode 100644
index 000000000000..222a174ef381
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-3568.rs
@@ -0,0 +1,7 @@
+pub type T = ();
+mod foo {
+    pub use super::T;
+}
+
+pub use foo::super::foo::S as T;
+// { dg-error ".super. can only be used in start position" "" { target *-*-* } .-1 }
diff --git a/gcc/testsuite/rust/compile/nr2/exclude b/gcc/testsuite/rust/compile/nr2/exclude
index 71c2b682bf02..9273bd1489e1 100644
--- a/gcc/testsuite/rust/compile/nr2/exclude
+++ b/gcc/testsuite/rust/compile/nr2/exclude
@@ -36,4 +36,5 @@ torture/alt_patterns1.rs
 torture/loop4.rs
 torture/loop8.rs
 torture/name_resolve1.rs
+issue-3568.rs
 # please don't delete the trailing newline