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[clang] add id -> pvar bindings to C++ lambda capture

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Summary: In Obj-C blocks, we explicitly insert reads of the captured vars. This does the same thing for C++. For example, `foo() { int x = 1; [x]() { return x; } }` would previously not contain a read of `x` in `foo`. Now, we'll create a temporary that reads from `x` and pass it to the closure value.

Reviewed By: dulmarod

Differential Revision: D6939997

fbshipit-source-id: f218afc
master
Sam Blackshear 7 years ago committed by Facebook Github Bot
parent 89ec1effde
commit 9366e8dbc8
2 changed files with 47 additions and 36 deletions
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71
infer/src/clang/cTrans.ml
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@ -266,6 +266,27 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
{empty_res_trans with instrs= [call_instr']; exps= ret_exps; initd_exps} {empty_res_trans with instrs= [call_instr']; exps= ret_exps; initd_exps}
(* Given a captured var, return the instruction to assign it to a temp *)
let assign_captured_var loc (cvar, typ) =
let id = Ident.create_fresh Ident.knormal in
let instr = Sil.Load (id, Exp.Lvar cvar, typ, loc) in
(id, instr)
let closure_trans closure_pname captured_vars context stmt_info expr_info =
let loc = CLocation.get_sil_location stmt_info context in
let open CContext in
let qual_type = expr_info.Clang_ast_t.ei_qual_type in
let typ = CType_decl.qual_type_to_sil_type context.tenv qual_type in
let ids_instrs = List.map ~f:(assign_captured_var loc) captured_vars in
let ids, instrs = List.unzip ids_instrs in
let captured_vars =
List.map2_exn ~f:(fun id (pvar, typ) -> (Exp.Var id, pvar, typ)) ids captured_vars
in
let closure = Exp.Closure {name= closure_pname; captured_vars} in
{empty_res_trans with instrs; exps= [(closure, typ)]}
let stringLiteral_trans trans_state expr_info str = let stringLiteral_trans trans_state expr_info str =
let typ = CType_decl.get_type_from_expr_info expr_info trans_state.context.CContext.tenv in let typ = CType_decl.get_type_from_expr_info expr_info trans_state.context.CContext.tenv in
let exp = Exp.Const (Const.Cstr str) in let exp = Exp.Const (Const.Cstr str) in
@ -688,6 +709,7 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
let pvar = Pvar.mk (Mangled.from_string name) procname in let pvar = Pvar.mk (Mangled.from_string name) procname in
(pvar, CType_decl.qual_type_to_sil_type tenv class_qual_type) (pvar, CType_decl.qual_type_to_sil_type tenv class_qual_type)
let this_expr_trans stmt_info ?class_qual_type trans_state sil_loc = let this_expr_trans stmt_info ?class_qual_type trans_state sil_loc =
let this_pvar, this_typ = get_this_pvar_typ stmt_info ?class_qual_type trans_state.context in let this_pvar, this_typ = get_this_pvar_typ stmt_info ?class_qual_type trans_state.context in
let exps = [(Exp.Lvar this_pvar, this_typ)] in let exps = [(Exp.Lvar this_pvar, this_typ)] in
@ -2606,38 +2628,21 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
and blockExpr_trans trans_state stmt_info expr_info decl = and blockExpr_trans trans_state stmt_info expr_info decl =
let context = trans_state.context in let context = trans_state.context in
let procname = Procdesc.get_proc_name context.CContext.procdesc in let procname = Procdesc.get_proc_name context.CContext.procdesc in
let loc =
match stmt_info.Clang_ast_t.si_source_range with l1, _ ->
CLocation.clang_to_sil_location context.CContext.translation_unit_context l1
in
(* Given a captured var, return the instruction to assign it to a temp *)
let assign_captured_var (cvar, typ) =
let id = Ident.create_fresh Ident.knormal in
let instr = Sil.Load (id, Exp.Lvar cvar, typ, loc) in
(id, instr)
in
match decl with match decl with
| Clang_ast_t.BlockDecl (_, block_decl_info) -> | Clang_ast_t.BlockDecl (_, block_decl_info) ->
let open CContext in let open CContext in
let qual_type = expr_info.Clang_ast_t.ei_qual_type in
let block_pname = CProcname.mk_fresh_block_procname procname in let block_pname = CProcname.mk_fresh_block_procname procname in
let typ = CType_decl.qual_type_to_sil_type context.tenv qual_type in let captured_pvars =
let captured_block_vars = block_decl_info.Clang_ast_t.bdi_captured_variables in
let captureds =
CVar_decl.captured_vars_from_block_info context stmt_info.Clang_ast_t.si_source_range CVar_decl.captured_vars_from_block_info context stmt_info.Clang_ast_t.si_source_range
captured_block_vars block_decl_info.Clang_ast_t.bdi_captured_variables
in in
let ids_instrs = List.map ~f:assign_captured_var captureds in let res = closure_trans block_pname captured_pvars context stmt_info expr_info in
let ids, instrs = List.unzip ids_instrs in let qual_type = expr_info.Clang_ast_t.ei_qual_type in
let block_data = (context, qual_type, block_pname, captureds) in let block_data = Some (context, qual_type, block_pname, captured_pvars) in
F.function_decl context.translation_unit_context context.tenv context.cfg decl F.function_decl context.translation_unit_context context.tenv context.cfg decl block_data ;
(Some block_data) ; res
let captured_vars =
List.map2_exn ~f:(fun id (pvar, typ) -> (Exp.Var id, pvar, typ)) ids captureds
in
let closure = Exp.Closure {name= block_pname; captured_vars} in
{empty_res_trans with instrs; exps= [(closure, typ)]}
| _ -> | _ ->
(* Block expression with no BlockDecl *)
assert false assert false
@ -2649,7 +2654,6 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
let procname = Procdesc.get_proc_name context.procdesc in let procname = Procdesc.get_proc_name context.procdesc in
let lambda_pname = CMethod_trans.get_procname_from_cpp_lambda context lei_lambda_decl in let lambda_pname = CMethod_trans.get_procname_from_cpp_lambda context lei_lambda_decl in
let typ = CType_decl.qual_type_to_sil_type context.tenv qual_type in let typ = CType_decl.qual_type_to_sil_type context.tenv qual_type in
let make_captured_tuple (pvar, typ) = (Exp.Lvar pvar, pvar, typ) in
let get_captured_pvar_typ decl_ref = let get_captured_pvar_typ decl_ref =
CVar_decl.sil_var_of_captured_var decl_ref context stmt_info.Clang_ast_t.si_source_range CVar_decl.sil_var_of_captured_var decl_ref context stmt_info.Clang_ast_t.si_source_range
procname procname
@ -2659,7 +2663,14 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
| Clang_ast_t.VarDecl (_, _, _, {vdi_init_expr}) -> | Clang_ast_t.VarDecl (_, _, _, {vdi_init_expr}) ->
init_expr_trans trans_state (Exp.Lvar pvar, typ) stmt_info vdi_init_expr init_expr_trans trans_state (Exp.Lvar pvar, typ) stmt_info vdi_init_expr
| _ -> | _ ->
L.die ExternalError "Unexpected: capture-init statement without var decl" CFrontend_config.incorrect_assumption __POS__ stmt_info.Clang_ast_t.si_source_range
"Capture-init statement without var decl"
in
let translate_normal_capture pvar_typ (trans_results_acc, captured_vars_acc) =
let loc = CLocation.get_sil_location stmt_info context in
let id, instr = assign_captured_var loc pvar_typ in
let trans_results = {empty_res_trans with instrs= [instr]} in
(trans_results :: trans_results_acc, (Exp.Var id, fst pvar_typ, snd pvar_typ) :: captured_vars_acc)
in in
let translate_captured let translate_captured
{Clang_ast_t.lci_captured_var; lci_init_captured_vardecl; lci_capture_this} {Clang_ast_t.lci_captured_var; lci_init_captured_vardecl; lci_capture_this}
@ -2669,16 +2680,16 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
(* capture and init *) (* capture and init *)
let pvar_typ = get_captured_pvar_typ captured_var_decl_ref in let pvar_typ = get_captured_pvar_typ captured_var_decl_ref in
( translate_capture_init pvar_typ init_decl :: trans_results_acc ( translate_capture_init pvar_typ init_decl :: trans_results_acc
, make_captured_tuple pvar_typ :: captured_vars_acc ) , (Exp.Lvar (fst pvar_typ), fst pvar_typ, snd pvar_typ) :: captured_vars_acc )
| Some captured_var_decl_ref, None -> | Some captured_var_decl_ref, None ->
(* just capture *) (* just capture *)
let pvar_typ = get_captured_pvar_typ captured_var_decl_ref in let pvar_typ = get_captured_pvar_typ captured_var_decl_ref in
(trans_results_acc, make_captured_tuple pvar_typ :: captured_vars_acc) translate_normal_capture pvar_typ acc
| None, None -> | None, None ->
if lci_capture_this then if lci_capture_this then
(* captured [this] *) (* captured [this] *)
let this_typ = get_this_pvar_typ stmt_info context in let this_typ = get_this_pvar_typ stmt_info context in
(trans_results_acc, make_captured_tuple this_typ :: captured_vars_acc) translate_normal_capture this_typ acc
else acc else acc
| None, Some _ -> | None, Some _ ->
CFrontend_config.incorrect_assumption __POS__ stmt_info.Clang_ast_t.si_source_range CFrontend_config.incorrect_assumption __POS__ stmt_info.Clang_ast_t.si_source_range

12
infer/tests/codetoanalyze/cpp/shared/lambda/lambda1.cpp.dot
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@ -56,7 +56,7 @@ digraph cfg {
"normal_capture#5533029764254319855.11493b249dddd657790695e287170b84_2" [label="2: Exit normal_capture \n " color=yellow style=filled] "normal_capture#5533029764254319855.11493b249dddd657790695e287170b84_2" [label="2: Exit normal_capture \n " color=yellow style=filled]
"normal_capture#5533029764254319855.11493b249dddd657790695e287170b84_3" [label="3: Return Stmt \n n$0=_fun_normal_capture::lambda_shared_lambda_lambda1.cpp:33:10_operator()((_fun_normal_capture::lambda_shared_lambda_lambda1.cpp:33:10_operator(),&x,&y):normal_capture::lambda_shared_lambda_lambda1.cpp:33:10) [line 33, column 10]\n *&return:int=n$0 [line 33, column 3]\n " shape="box"] "normal_capture#5533029764254319855.11493b249dddd657790695e287170b84_3" [label="3: Return Stmt \n n$1=*&x:int [line 33, column 10]\n n$0=*&y:int [line 33, column 10]\n n$2=_fun_normal_capture::lambda_shared_lambda_lambda1.cpp:33:10_operator()((_fun_normal_capture::lambda_shared_lambda_lambda1.cpp:33:10_operator(),(n$1 &x:int),(n$0 &y:int)):normal_capture::lambda_shared_lambda_lambda1.cpp:33:10) [line 33, column 10]\n *&return:int=n$2 [line 33, column 3]\n " shape="box"]
"normal_capture#5533029764254319855.11493b249dddd657790695e287170b84_3" -> "normal_capture#5533029764254319855.11493b249dddd657790695e287170b84_2" ; "normal_capture#5533029764254319855.11493b249dddd657790695e287170b84_3" -> "normal_capture#5533029764254319855.11493b249dddd657790695e287170b84_2" ;
@ -79,7 +79,7 @@ digraph cfg {
"capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_3" -> "capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_2" ; "capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_3" -> "capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_2" ;
"capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_4" [label="4: Call _fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator() \n _fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator()((_fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator(),&x):capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3) [line 38, column 3]\n " shape="box"] "capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_4" [label="4: Call _fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator() \n n$1=*&x:int [line 38, column 3]\n _fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator()((_fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator(),(n$1 &x:int)):capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3) [line 38, column 3]\n " shape="box"]
"capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_4" -> "capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_3" ; "capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_4" -> "capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_3" ;
@ -136,7 +136,7 @@ digraph cfg {
"capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_2" [label="2: Exit Capture_capture_this_explicit \n " color=yellow style=filled] "capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_2" [label="2: Exit Capture_capture_this_explicit \n " color=yellow style=filled]
"capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_3" [label="3: DeclStmt \n *&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19=(_fun_Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19_operator(),&this) [line 55, column 19]\n _fun_Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19_(&lambda:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19*,&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19&) [line 55, column 19]\n " shape="box"] "capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_3" [label="3: DeclStmt \n n$1=*&this:Capture* [line 55, column 19]\n *&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19=(_fun_Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19_operator(),(n$1 &this:Capture*)) [line 55, column 19]\n _fun_Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19_(&lambda:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19*,&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19&) [line 55, column 19]\n " shape="box"]
"capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_3" -> "capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_2" ; "capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_3" -> "capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_2" ;
@ -147,7 +147,7 @@ digraph cfg {
"capture_star_this#Capture#(2506493005619132138).63fd6aa2a7efbd48dc1a62c0c2bd2161_2" [label="2: Exit Capture_capture_star_this \n " color=yellow style=filled] "capture_star_this#Capture#(2506493005619132138).63fd6aa2a7efbd48dc1a62c0c2bd2161_2" [label="2: Exit Capture_capture_star_this \n " color=yellow style=filled]
"capture_star_this#Capture#(2506493005619132138).63fd6aa2a7efbd48dc1a62c0c2bd2161_3" [label="3: DeclStmt \n *&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19=(_fun_Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19_operator(),&this) [line 59, column 19]\n _fun_Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19_(&lambda:Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19*,&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19&) [line 59, column 19]\n " shape="box"] "capture_star_this#Capture#(2506493005619132138).63fd6aa2a7efbd48dc1a62c0c2bd2161_3" [label="3: DeclStmt \n n$1=*&this:Capture* [line 59, column 19]\n *&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19=(_fun_Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19_operator(),(n$1 &this:Capture*)) [line 59, column 19]\n _fun_Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19_(&lambda:Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19*,&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_star_this::lambda_shared_lambda_lambda1.cpp:59:19&) [line 59, column 19]\n " shape="box"]
"capture_star_this#Capture#(2506493005619132138).63fd6aa2a7efbd48dc1a62c0c2bd2161_3" -> "capture_star_this#Capture#(2506493005619132138).63fd6aa2a7efbd48dc1a62c0c2bd2161_2" ; "capture_star_this#Capture#(2506493005619132138).63fd6aa2a7efbd48dc1a62c0c2bd2161_3" -> "capture_star_this#Capture#(2506493005619132138).63fd6aa2a7efbd48dc1a62c0c2bd2161_2" ;
@ -158,7 +158,7 @@ digraph cfg {
"capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_2" [label="2: Exit Capture_capture_this_with_equal \n " color=yellow style=filled] "capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_2" [label="2: Exit Capture_capture_this_with_equal \n " color=yellow style=filled]
"capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_3" [label="3: DeclStmt \n *&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19=(_fun_Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19_operator(),&this) [line 65, column 19]\n _fun_Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19_(&lambda:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19*,&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19&) [line 65, column 19]\n " shape="box"] "capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_3" [label="3: DeclStmt \n n$1=*&this:Capture* [line 65, column 19]\n *&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19=(_fun_Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19_operator(),(n$1 &this:Capture*)) [line 65, column 19]\n _fun_Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19_(&lambda:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19*,&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19&) [line 65, column 19]\n " shape="box"]
"capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_3" -> "capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_2" ; "capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_3" -> "capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_2" ;
@ -169,7 +169,7 @@ digraph cfg {
"capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_2" [label="2: Exit Capture_capture_this_with_auto \n " color=yellow style=filled] "capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_2" [label="2: Exit Capture_capture_this_with_auto \n " color=yellow style=filled]
"capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_3" [label="3: DeclStmt \n *&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19=(_fun_Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19_operator(),&this) [line 69, column 19]\n _fun_Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19_(&lambda:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19*,&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19&) [line 69, column 19]\n " shape="box"] "capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_3" [label="3: DeclStmt \n n$1=*&this:Capture* [line 69, column 19]\n *&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19=(_fun_Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19_operator(),(n$1 &this:Capture*)) [line 69, column 19]\n _fun_Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19_(&lambda:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19*,&0$?%__sil_tmpSIL_materialize_temp__n$0:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19&) [line 69, column 19]\n " shape="box"]
"capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_3" -> "capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_2" ; "capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_3" -> "capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_2" ;

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