Rust-GCC / Rust-GCC/gccrs

ICE: ` tree check: expected none of record_type or union_type or qual_union_type or array_type, have record_type in fold_binary_loc`

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bug
Dominant language
C++
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Description

auto-reduced (treereduce-rust):

//@compile-flags: -frust-incomplete-and-experimental-compiler-do-not-use
fn foo() {
    let _ = [0u64; {} + 1];
}

original:

fn foo<const N: usize>() {
    let _ = [0u64; {
    let _ = [0u64; N + 1];
} + 1];
}

fn main() {}

Version information:

5c3e2adc695b04a199d37cacd8c23b14fdab914f

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

Program output

/tmp/icemaker_global_tempdir.n4soCVqUjDHu/rustc_testrunner_tmpdir_reporting.WBnrh9dCHsW4/mvce.rs:2:20: error: cannot apply operator ‘+’ to types () and <integer>
    2 |     let _ = [0u64; {} + 1];
      |                    ^
/tmp/icemaker_global_tempdir.n4soCVqUjDHu/rustc_testrunner_tmpdir_reporting.WBnrh9dCHsW4/mvce.rs:2:13: error: mismatched types, expected ‘usize’ but got ‘<tyty::error>’ [E0308]
    2 |     let _ = [0u64; {} + 1];
      |             ^      ~
crab1: internal compiler error: tree check: expected none of record_type or union_type or qual_union_type or array_type, have record_type in fold_binary_loc, at fold-const.cc:11431
0x2fec938 internal_error(char const*, ...)
	../../gcc/diagnostic-global-context.cc:517
0xa7e629 tree_not_check_failed(tree_node const*, char const*, int, char const*, ...)
	../../gcc/tree.cc:9139
0x95a9f9 tree_not_check4(tree_node*, char const*, int, char const*, tree_code, tree_code, tree_code, tree_code)
	../../gcc/tree.h:3788
0x95a9f9 fold_binary_loc(unsigned long, tree_code, tree_node*, tree_node*, tree_node*)
	../../gcc/fold-const.cc:11431
0x1453efe fold_build2_loc(unsigned long, tree_code, tree_node*, tree_node*, tree_node*)
	../../gcc/fold-const.cc:13953
0xc87a6d Backend::arithmetic_or_logical_expression(ArithmeticOrLogicalOperator, tree_node*, tree_node*, unsigned long)
	../../gcc/rust/rust-gcc.cc:1092
0xc87a6d Backend::arithmetic_or_logical_expression(ArithmeticOrLogicalOperator, tree_node*, tree_node*, unsigned long)
	../../gcc/rust/rust-gcc.cc:1053
0x1166351 Rust::Compile::CompileExpr::visit(Rust::HIR::ArithmeticOrLogicalExpr&)
	../../gcc/rust/backend/rust-compile-expr.cc:168
0x1162ab6 Rust::Compile::CompileExpr::Compile(Rust::HIR::Expr&, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile-expr.cc:48
0x118e72f Rust::Compile::HIRCompileBase::compile_constant_item(unsigned int, Rust::TyTy::BaseType*, Rust::TyTy::BaseType*, Rust::Resolver::CanonicalPath const&, Rust::HIR::Expr&, unsigned long, unsigned long)
	../../gcc/rust/backend/rust-compile-base.cc:869
0x118ee84 Rust::Compile::HIRCompileBase::compile_constant_expr(Rust::Compile::Context*, unsigned int, Rust::TyTy::BaseType*, Rust::TyTy::BaseType*, Rust::Resolver::CanonicalPath const&, Rust::HIR::Expr&, unsigned long, unsigned long)
	../../gcc/rust/backend/rust-compile-base.cc:573
0x118ee84 Rust::Compile::HIRCompileBase::query_compile_const_expr(Rust::Compile::Context*, Rust::TyTy::BaseType*, Rust::HIR::Expr&)
	../../gcc/rust/backend/rust-compile-base.cc:588
0x109f700 Rust::Resolver::TypeCheckExpr::visit(Rust::HIR::ArrayExpr&)
	../../gcc/rust/typecheck/rust-hir-type-check-expr.cc:1111
0x109a314 Rust::Resolver::TypeCheckExpr::Resolve(Rust::HIR::Expr&)
	../../gcc/rust/typecheck/rust-hir-type-check-expr.cc:50
0x10a9eb1 Rust::Resolver::TypeCheckStmt::visit(Rust::HIR::LetStmt&)
	../../gcc/rust/typecheck/rust-hir-type-check-stmt.cc:90
0x10a9fa3 Rust::Resolver::TypeCheckStmt::Resolve(Rust::HIR::Stmt&)
	../../gcc/rust/typecheck/rust-hir-type-check-stmt.cc:34
0x109bd31 Rust::Resolver::TypeCheckExpr::visit(Rust::HIR::BlockExpr&)
	../../gcc/rust/typecheck/rust-hir-type-check-expr.cc:609
0x109a314 Rust::Resolver::TypeCheckExpr::Resolve(Rust::HIR::Expr&)
	../../gcc/rust/typecheck/rust-hir-type-check-expr.cc:50
0x1077370 Rust::Resolver::TypeCheckItem::visit(Rust::HIR::Function&)
	../../gcc/rust/typecheck/rust-hir-type-check-item.cc:642
0x106e105 Rust::Resolver::TypeCheckItem::Resolve(Rust::HIR::Item&)
	../../gcc/rust/typecheck/rust-hir-type-check-item.cc:59
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.

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Research direction

Reproduce the reduced Rust case with the reported compiler command and inspect Backend::arithmetic_or_logical_expression in gcc/rust/rust-gcc.cc. Follow the constant-expression path through rust-compile-expr.cc, rust-compile-base.cc, and rust-hir-type-check-expr.cc. Done means the case emits diagnostics without triggering the internal compiler error.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp, rust
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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