internal compiler error: in convert_tree, at rust/ru... | Rust-GCC/gccrs

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auto-reduced (treereduce-rust):

//@compile-flags: -frust-incomplete-and-experimental-compiler-do-not-use
#![feature(no_core)]
#![no_core]
fn main() {
    let mut a;
    struct S;
    // Error
    // Works
    enum E {
        A = 0,
        B = 1,
    }
    // Error
    (E::A {}, a) = (E::A, ()); // Works
}

original:

#![feature(no_core)]
#![no_core]
fn main() {
    let mut a;
    struct S;
    (S, a) = (S, ()); // Error
    (S {}, a) = (S, ()); // Works
    enum E {
    A = 0,
    B = 1,
}
    (E::A, a) = (E::A, ()); // Error
    (E::A {}, a) = (E::A, ()); // Works
}

Version information:

1a9102843099b18f9dbb6b5e979436f6c4566f1c

Command:
/home/matthias/vcs/github/gccrs/gccrs-build/gcc/crab1 -frust-incomplete-and-experimental-compiler-do-not-use

Program output

crab1: internal compiler error: in convert_tree, at rust/rust-gcc.cc:1956
0x3097ef9 internal_error(char const*, ...)
	../../gcc/diagnostic-global-context.cc:787
0xc3aa61 fancy_abort(char const*, int, char const*)
	../../gcc/diagnostics/context.cc:1813
0x90dd3a Backend::convert_tree(tree_node*, tree_node*, unsigned long)
	../../gcc/rust/rust-gcc.cc:1956
0x90dd3a Backend::convert_tree(tree_node*, tree_node*, unsigned long)
	../../gcc/rust/rust-gcc.cc:1941
0xcc6cd9 Backend::constructor_expression(tree_node*, bool, std::vector<tree_node*, std::allocator<tree_node*> > const&, int, unsigned long)
	../../gcc/rust/rust-gcc.cc:1364
0x1136956 Rust::Compile::CompileExpr::visit(Rust::HIR::TupleExpr&)
	../../gcc/rust/backend/rust-compile-expr.cc:110
0x1136956 Rust::Compile::CompileExpr::visit(Rust::HIR::TupleExpr&)
	../../gcc/rust/backend/rust-compile-expr.cc:82
0x1137c27 Rust::Compile::CompileExpr::Compile(Rust::HIR::Expr&, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile-expr.cc:52
0x1137c27 Rust::Compile::CompileExpr::visit(Rust::HIR::AssignmentExpr&)
	../../gcc/rust/backend/rust-compile-expr.cc:1074
0x113b516 Rust::Compile::CompileExpr::Compile(Rust::HIR::Expr&, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile-expr.cc:52
0x1132450 ???
	../../gcc/rust/backend/rust-compile-stmt.h:33
0x113278c Rust::Compile::CompileStmt::Compile(Rust::HIR::Stmt*, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile-stmt.cc:36
0x11651cc Rust::Compile::HIRCompileBase::compile_function_body(tree_node*, Rust::HIR::BlockExpr&, Rust::TyTy::BaseType*)
	../../gcc/rust/backend/rust-compile-base.cc:607
0x11693d1 Rust::Compile::HIRCompileBase::compile_function(bool, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, tl::optional<Rust::HIR::SelfParam>&, std::vector<Rust::HIR::FunctionParam, std::allocator<Rust::HIR::FunctionParam> >&, Rust::HIR::FunctionQualifiers const&, Rust::HIR::Visibility&, std::vector<Rust::AST::Attribute, std::allocator<Rust::AST::Attribute> >&, unsigned long, Rust::HIR::BlockExpr*, Rust::Resolver::CanonicalPath const&, Rust::TyTy::FnType*)
	../../gcc/rust/backend/rust-compile-base.cc:809
0x1130c11 Rust::Compile::CompileItem::visit(Rust::HIR::Function&)
	../../gcc/rust/backend/rust-compile-item.cc:231
0xe7fa0b Rust::Compile::CompileItem::compile(Rust::HIR::Item*, Rust::Compile::Context*, Rust::TyTy::BaseType*, unsigned long)
	../../gcc/rust/backend/rust-compile-item.h:37
0xe7fa0b Rust::Compile::CompileCrate::go()
	../../gcc/rust/backend/rust-compile.cc:48
0xe7fa0b Rust::Compile::CompileCrate::Compile(Rust::HIR::Crate&, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile.cc:41
0xe74e7e Rust::Session::compile_crate(char const*)
	../../gcc/rust/rust-session-manager.cc:810
/home/matthias/vcs/github/gccrs/gccrs-build/gcc/crab1 /tmp/icemaker_global_tempdir.r6jYInQCIUD7/rustc_testrunner_tmpdir_reporting.H945cOjyAJfM/mvce.rs -o/tmp/icemaker_global_tempdir.r6jYInQCIUD7/rustc_testrunner_tmpdir_reporting.H945cOjyAJfM/binaryname -frust-incomplete-and-experimental-compiler-do-not-use
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Reproduce the reduced Rust case with the command shown, then inspect gcc/rust/rust-gcc.cc:1950-1962 and the call path through gcc/rust/backend/rust-compile-expr.cc. Compare the failing tuple assignment with the working variants and determine why convert_tree reaches the internal error. Done means the reduced case no longer triggers an internal compiler error.

Written by the indexing model from the issue text.

internal compiler error: in convert_tree, at rust/rust-gcc.cc:

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