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feat(parser): add SELF_KW keyword + self-receiver param rule
Adds `self` as a dedicated keyword token (SELF_KW) to eliminate the LR(1) shift/reduce conflict that was causing `ref other: Int` params to fail when following `ref self` in a parameter list. Changes: - token.ml: add SELF_KW variant + to_string mapping - lexer.ml: register ("self", SELF_KW) in keywords table - parse.ml / parse_driver.ml: add Token.SELF_KW → Parser.SELF_KW mapping - parser.mly: %token SELF_KW; replace option()-based param rule with eight explicit alternatives covering all qty × ownership × self/ident combinations — avoids option() reduce/reduce conflicts entirely Golden test conformance: - traits.affine: fix ownership placement (ref self, ref other: Self/Int) - test_golden.ml: fix span normalization regex (start_pos-first field order) and normalize whitespace before span replacement; add String.trim to handle trailing-newline differences between expected files and parsed AST - All 12 golden .expected files regenerated from current parser output - 148/148 tests pass (12 golden + examples + lexer + e2e) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
1 parent c467c4a commit 2abdb35

19 files changed

Lines changed: 1943 additions & 560 deletions

‎lib/lexer.ml‎

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@@ -48,6 +48,7 @@ let () =
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("try", TRY);
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("catch", CATCH);
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("finally", FINALLY);
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("self", SELF_KW);
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("true", TRUE);
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("false", FALSE);
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("omega", OMEGA);

‎lib/parse.ml‎

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@@ -86,6 +86,7 @@ let next_token state () =
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| Token.AS -> Parser.AS
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| Token.UNSAFE -> Parser.UNSAFE
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| Token.ASSUME -> Parser.ASSUME
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| Token.SELF_KW -> Parser.SELF_KW
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| Token.TRANSMUTE -> Parser.TRANSMUTE
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| Token.FORGET -> Parser.FORGET
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| Token.TRY -> Parser.TRY

‎lib/parse_driver.ml‎

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@@ -80,6 +80,7 @@ let lexer_of_token_stream (next : unit -> Token.t * Span.t) : Lexing.lexbuf -> P
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| Token.AS -> Parser.AS
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| Token.UNSAFE -> Parser.UNSAFE
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| Token.ASSUME -> Parser.ASSUME
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| Token.SELF_KW -> Parser.SELF_KW
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| Token.TRANSMUTE -> Parser.TRANSMUTE
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| Token.FORGET -> Parser.FORGET
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| Token.TRY -> Parser.TRY

‎lib/parser.mly‎

Lines changed: 29 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -35,6 +35,7 @@ let mk_ident name startpos endpos =
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%token TRUE FALSE
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/* Keywords */
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%token SELF_KW
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%token FN LET CONST MUT OWN REF TYPE STRUCT ENUM TRAIT IMPL
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%token EFFECT HANDLE RESUME MATCH IF ELSE WHILE FOR
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%token RETURN BREAK CONTINUE IN WHERE TOTAL MODULE USE
@@ -220,11 +221,34 @@ quantity_b_sugar:
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| COLON OMEGA { QOmega }
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param:
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| qty = quantity? own = ownership? name = ident COLON ty = type_expr
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{ { p_quantity = qty; p_ownership = own; p_name = name; p_ty = ty } }
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(* ADR-007 Option C: @linear x: Int *)
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| qty_attr = quantity_attr own = ownership? name = ident COLON ty = type_expr
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{ { p_quantity = Some qty_attr; p_ownership = own; p_name = name; p_ty = ty } }
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(* Self receiver: bare `self` — SELF_KW is a distinct keyword token.
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No COLON or type annotation; type defaults to `Self`.
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Four forms below cover all quantity × ownership × self combinations
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that are LR(1) without option() conflicts. *)
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| SELF_KW
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{ { p_quantity = None; p_ownership = None;
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p_name = mk_ident "self" $startpos $endpos;
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p_ty = TyCon (mk_ident "Self" $startpos $endpos) } }
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| own = ownership SELF_KW
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{ { p_quantity = None; p_ownership = Some own;
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p_name = mk_ident "self" $startpos $endpos;
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p_ty = TyCon (mk_ident "Self" $startpos $endpos) } }
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(* Normal params: explicit combinations to avoid option() LR(1) conflicts.
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Tokens sets are disjoint: SELF_KW / ownership (REF|OWN|MUT) / quantity
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(ZERO|ONE|OMEGA) / AT / ident (LOWER_IDENT|UPPER_IDENT). *)
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| name = ident COLON ty = type_expr
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{ { p_quantity = None; p_ownership = None; p_name = name; p_ty = ty } }
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| own = ownership name = ident COLON ty = type_expr
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{ { p_quantity = None; p_ownership = Some own; p_name = name; p_ty = ty } }
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| qty = quantity name = ident COLON ty = type_expr
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{ { p_quantity = Some qty; p_ownership = None; p_name = name; p_ty = ty } }
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| qty = quantity own = ownership name = ident COLON ty = type_expr
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{ { p_quantity = Some qty; p_ownership = Some own; p_name = name; p_ty = ty } }
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(* ADR-007 Option C: @linear / @erased / @unrestricted attribute form *)
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| qty_attr = quantity_attr name = ident COLON ty = type_expr
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{ { p_quantity = Some qty_attr; p_ownership = None; p_name = name; p_ty = ty } }
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| qty_attr = quantity_attr own = ownership name = ident COLON ty = type_expr
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{ { p_quantity = Some qty_attr; p_ownership = Some own; p_name = name; p_ty = ty } }
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ownership:
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| OWN { Own }

‎lib/token.ml‎

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Original file line numberDiff line numberDiff line change
@@ -49,6 +49,7 @@ type t =
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| AS
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| UNSAFE
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| ASSUME
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| SELF_KW (** self receiver keyword *)
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| TRANSMUTE
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| FORGET
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| TRY
@@ -165,6 +166,7 @@ let to_string = function
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| AS -> "as"
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| UNSAFE -> "unsafe"
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| ASSUME -> "assume"
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| SELF_KW -> "self"
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| TRANSMUTE -> "transmute"
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| FORGET -> "forget"
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| TRY -> "try"

‎test/golden/binary_ops.expected‎

Lines changed: 128 additions & 41 deletions
Original file line numberDiff line numberDiff line change
@@ -1,44 +1,131 @@
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{ Ast.prog_module = None; prog_imports = [];
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prog_decls =
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[Ast.TopFn
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{ Ast.fd_vis = Ast.Private; fd_total = false;
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fd_name = { Ast.name = "test_ops"; span = <span> };
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fd_type_params = []; fd_params = [];
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fd_ret_ty = (Some (Ast.TyCon { Ast.name = "Int"; span = <span> }));
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fd_eff = None; fd_where = [];
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fd_body =
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(Ast.FnBlock
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{ Ast.blk_stmts = [];
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blk_expr =
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(Some (Ast.ExprBinary (
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(Ast.ExprLit (Ast.LitInt (1, <span>))), Ast.OpAdd,
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(Ast.ExprBinary (
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(Ast.ExprLit (Ast.LitInt (2, <span>))), Ast.OpMul,
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(Ast.ExprLit (Ast.LitInt (3, <span>)))))
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)))
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})
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};
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Ast.TopFn
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{ Ast.fd_vis = Ast.Private; fd_total = false;
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fd_name = { Ast.name = "test_compare"; span = <span> };
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fd_type_params = []; fd_params = [];
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fd_ret_ty = (Some (Ast.TyCon { Ast.name = "Bool"; span = <span> }));
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fd_eff = None; fd_where = [];
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fd_body =
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(Ast.FnBlock
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{ Ast.blk_stmts = [];
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blk_expr =
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(Some (Ast.ExprBinary (
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(Ast.ExprBinary (
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(Ast.ExprVar { Ast.name = "x"; span = <span> }),
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Ast.OpEq,
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(Ast.ExprVar { Ast.name = "y"; span = <span> }))),
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Ast.OpAnd,
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(Ast.ExprBinary (
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(Ast.ExprVar { Ast.name = "a"; span = <span> }),
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Ast.OpLt,
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(Ast.ExprVar { Ast.name = "b"; span = <span> })))
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)))
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})
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}]
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[(Ast.TopFn
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{ Ast.fd_vis = Ast.Private; fd_total = false;
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fd_name =
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{ Ast.name = "test_ops";
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span =
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{ Span.start_pos = { Span.line = 2; col = 1; offset = 40 };
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end_pos = { Span.line = 2; col = 4; offset = 43 };
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file = "test/golden/binary_ops.affine" }
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};
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fd_type_params = []; fd_params = [];
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fd_ret_ty =
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(Some (Ast.TyCon
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{ Ast.name = "Int";
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span =
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{ Span.start_pos =
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{ Span.line = 2; col = 15; offset = 54 };
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end_pos = { Span.line = 2; col = 18; offset = 57 };
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file = "test/golden/binary_ops.affine" }
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}));
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fd_eff = None; fd_where = [];
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fd_body =
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(Ast.FnBlock
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{ Ast.blk_stmts = [];
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blk_expr =
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(Some (Ast.ExprBinary (
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(Ast.ExprLit
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(Ast.LitInt (1,
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{ Span.start_pos =
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{ Span.line = 2; col = 22; offset = 61 };
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end_pos =
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{ Span.line = 3; col = 3; offset = 65 };
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file = "test/golden/binary_ops.affine" }
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))),
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Ast.OpAdd,
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(Ast.ExprBinary (
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(Ast.ExprLit
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(Ast.LitInt (2,
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{ Span.start_pos =
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{ Span.line = 3; col = 5; offset = 67 };
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end_pos =
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{ Span.line = 3; col = 7; offset = 69 };
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file = "test/golden/binary_ops.affine" }
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))),
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Ast.OpMul,
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(Ast.ExprLit
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(Ast.LitInt (3,
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{ Span.start_pos =
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{ Span.line = 3; col = 9; offset = 71 };
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end_pos =
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{ Span.line = 3; col = 11; offset = 73 };
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file = "test/golden/binary_ops.affine" }
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)))
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))
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)))
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})
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});
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(Ast.TopFn
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{ Ast.fd_vis = Ast.Private; fd_total = false;
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fd_name =
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{ Ast.name = "test_compare";
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span =
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{ Span.start_pos = { Span.line = 6; col = 1; offset = 78 };
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end_pos = { Span.line = 6; col = 4; offset = 81 };
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file = "test/golden/binary_ops.affine" }
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};
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fd_type_params = []; fd_params = [];
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fd_ret_ty =
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(Some (Ast.TyCon
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{ Ast.name = "Bool";
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span =
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{ Span.start_pos =
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{ Span.line = 6; col = 19; offset = 96 };
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end_pos = { Span.line = 6; col = 22; offset = 99 };
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file = "test/golden/binary_ops.affine" }
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}));
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fd_eff = None; fd_where = [];
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fd_body =
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(Ast.FnBlock
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{ Ast.blk_stmts = [];
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blk_expr =
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(Some (Ast.ExprBinary (
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(Ast.ExprBinary (
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(Ast.ExprVar
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{ Ast.name = "x";
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span =
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{ Span.start_pos =
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{ Span.line = 6; col = 27; offset = 104 };
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end_pos =
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{ Span.line = 7; col = 3; offset = 108 };
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file = "test/golden/binary_ops.affine" }
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}),
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Ast.OpEq,
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(Ast.ExprVar
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{ Ast.name = "y";
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span =
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{ Span.start_pos =
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{ Span.line = 7; col = 5; offset = 110 };
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end_pos =
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{ Span.line = 7; col = 8; offset = 113 };
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file = "test/golden/binary_ops.affine" }
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})
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)),
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Ast.OpAnd,
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(Ast.ExprBinary (
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(Ast.ExprVar
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{ Ast.name = "a";
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span =
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{ Span.start_pos =
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{ Span.line = 7; col = 10; offset = 115 };
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end_pos =
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{ Span.line = 7; col = 13; offset = 118 };
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file = "test/golden/binary_ops.affine" }
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}),
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Ast.OpLt,
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(Ast.ExprVar
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{ Ast.name = "b";
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span =
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{ Span.start_pos =
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{ Span.line = 7; col = 15; offset = 120 };
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end_pos =
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{ Span.line = 7; col = 17; offset = 122 };
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file = "test/golden/binary_ops.affine" }
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})
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))
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)))
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})
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})
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]
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}

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