From: Philip Herron Date: Mon, 27 Feb 2023 17:39:09 +0000 (+0000) Subject: gccrs: bug-fix implicit inference checks X-Git-Tag: basepoints/gcc-15~2832 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49d5df4c826e14beaa9ee4c01c8fb710bd81a7bb;p=thirdparty%2Fgcc.git gccrs: bug-fix implicit inference checks When generating implicit inference variables we can miss cases where the other side might be another inference variable too but it runs the risk of generating unending inference cycles needing more info but if they other side is a non general inference variables like or this is safe to do so and allows us to infer mroe cases. Signed-off-by: Philip Herron gcc/rust/ChangeLog: * typecheck/rust-unify.cc (UnifyRules::go): fix inference check --- diff --git a/gcc/rust/typecheck/rust-unify.cc b/gcc/rust/typecheck/rust-unify.cc index dcd1783c29a0..3af261db59e9 100644 --- a/gcc/rust/typecheck/rust-unify.cc +++ b/gcc/rust/typecheck/rust-unify.cc @@ -153,12 +153,22 @@ UnifyRules::go () { bool rgot_param = rtype->get_kind () == TyTy::TypeKind::PARAM; bool lhs_is_infer_var = ltype->get_kind () == TyTy::TypeKind::INFER; - bool expected_is_concrete = ltype->is_concrete () && !lhs_is_infer_var; + bool lhs_is_general_infer_var + = lhs_is_infer_var + && static_cast (ltype)->get_infer_kind () + == TyTy::InferType::GENERAL; + bool expected_is_concrete + = ltype->is_concrete () && !lhs_is_general_infer_var; bool rneeds_infer = expected_is_concrete && rgot_param; bool lgot_param = ltype->get_kind () == TyTy::TypeKind::PARAM; bool rhs_is_infer_var = rtype->get_kind () == TyTy::TypeKind::INFER; - bool receiver_is_concrete = rtype->is_concrete () && !rhs_is_infer_var; + bool rhs_is_general_infer_var + = rhs_is_infer_var + && static_cast (rtype)->get_infer_kind () + == TyTy::InferType::GENERAL; + bool receiver_is_concrete + = rtype->is_concrete () && !rhs_is_general_infer_var; bool lneeds_infer = receiver_is_concrete && lgot_param; if (rneeds_infer)