//
// In non-stmts contexts, expr can relax this trichotomy.
//
-// There are also two other expr subtypes: first, nonparen_expr
-// disallows exprs surrounded by parens (including tuple expressions),
-// this is necessary for BOX (place) expressions, so a parens expr
-// following the BOX is always parsed as the place. There is also
-// expr_norange used in index_expr, which disallows '..' in
-// expressions as that has special meaning inside of brackets.
+// There is also one other expr subtype: nonparen_expr disallows exprs
+// surrounded by parens (including tuple expressions), this is
+// necessary for BOX (place) expressions, so a parens expr following
+// the BOX is always parsed as the place.
stmts
: stmt { $$ = mk_node("stmts", 1, $1); }
| path_expr '{' struct_expr_fields '}' { $$ = mk_node("ExprStruct", 2, $1, $3); }
| nonblock_expr '.' path_generic_args_with_colons { $$ = mk_node("ExprField", 2, $1, $3); }
| nonblock_expr '.' LIT_INTEGER { $$ = mk_node("ExprTupleIndex", 1, $1); }
-| nonblock_expr '[' index_expr ']' { $$ = mk_node("ExprIndex", 2, $1, $3); }
+| nonblock_expr '[' maybe_expr ']' { $$ = mk_node("ExprIndex", 2, $1, $3); }
| nonblock_expr '(' maybe_exprs ')' { $$ = mk_node("ExprCall", 2, $1, $3); }
| '[' vec_expr ']' { $$ = mk_node("ExprVec", 1, $2); }
| '(' maybe_exprs ')' { $$ = mk_node("ExprParen", 1, $2); }
| nonblock_expr DOTDOT { $$ = mk_node("ExprRange", 2, $1, mk_none()); }
| nonblock_expr DOTDOT expr { $$ = mk_node("ExprRange", 2, $1, $3); }
| DOTDOT expr { $$ = mk_node("ExprRange", 2, mk_none(), $2); }
+| DOTDOT { $$ = mk_node("ExprRange", 2, mk_none(), mk_none()); }
| nonblock_expr AS ty { $$ = mk_node("ExprCast", 2, $1, $3); }
| BOX nonparen_expr { $$ = mk_node("ExprBox", 1, $2); }
| %prec BOXPLACE BOX '(' maybe_expr ')' nonblock_expr { $$ = mk_node("ExprBox", 2, $3, $5); }
| path_expr '{' struct_expr_fields '}' { $$ = mk_node("ExprStruct", 2, $1, $3); }
| expr '.' path_generic_args_with_colons { $$ = mk_node("ExprField", 2, $1, $3); }
| expr '.' LIT_INTEGER { $$ = mk_node("ExprTupleIndex", 1, $1); }
-| expr '[' index_expr ']' { $$ = mk_node("ExprIndex", 2, $1, $3); }
+| expr '[' maybe_expr ']' { $$ = mk_node("ExprIndex", 2, $1, $3); }
| expr '(' maybe_exprs ')' { $$ = mk_node("ExprCall", 2, $1, $3); }
| '(' maybe_exprs ')' { $$ = mk_node("ExprParen", 1, $2); }
| '[' vec_expr ']' { $$ = mk_node("ExprVec", 1, $2); }
| expr DOTDOT { $$ = mk_node("ExprRange", 2, $1, mk_none()); }
| expr DOTDOT expr { $$ = mk_node("ExprRange", 2, $1, $3); }
| DOTDOT expr { $$ = mk_node("ExprRange", 2, mk_none(), $2); }
+| DOTDOT { $$ = mk_node("ExprRange", 2, mk_none(), mk_none()); }
| expr AS ty { $$ = mk_node("ExprCast", 2, $1, $3); }
| BOX nonparen_expr { $$ = mk_node("ExprBox", 1, $2); }
| %prec BOXPLACE BOX '(' maybe_expr ')' expr { $$ = mk_node("ExprBox", 2, $3, $5); }
| path_expr '{' struct_expr_fields '}' { $$ = mk_node("ExprStruct", 2, $1, $3); }
| nonparen_expr '.' path_generic_args_with_colons { $$ = mk_node("ExprField", 2, $1, $3); }
| nonparen_expr '.' LIT_INTEGER { $$ = mk_node("ExprTupleIndex", 1, $1); }
-| nonparen_expr '[' index_expr ']' { $$ = mk_node("ExprIndex", 2, $1, $3); }
+| nonparen_expr '[' maybe_expr ']' { $$ = mk_node("ExprIndex", 2, $1, $3); }
| nonparen_expr '(' maybe_exprs ')' { $$ = mk_node("ExprCall", 2, $1, $3); }
| '[' vec_expr ']' { $$ = mk_node("ExprVec", 1, $2); }
| CONTINUE { $$ = mk_node("ExprAgain", 0); }
| nonparen_expr DOTDOT { $$ = mk_node("ExprRange", 2, $1, mk_none()); }
| nonparen_expr DOTDOT nonparen_expr { $$ = mk_node("ExprRange", 2, $1, $3); }
| DOTDOT nonparen_expr { $$ = mk_node("ExprRange", 2, mk_none(), $2); }
+| DOTDOT { $$ = mk_node("ExprRange", 2, mk_none(), mk_none()); }
| nonparen_expr AS ty { $$ = mk_node("ExprCast", 2, $1, $3); }
| BOX nonparen_expr { $$ = mk_node("ExprBox", 1, $2); }
| %prec BOXPLACE BOX '(' maybe_expr ')' expr { $$ = mk_node("ExprBox", 1, $3, $5); }
| nonblock_prefix_expr
;
-expr_norange
-: lit { $$ = mk_node("ExprLit", 1, $1); }
-| %prec IDENT
- path_expr { $$ = mk_node("ExprPath", 1, $1); }
-| SELF { $$ = mk_node("ExprPath", 1, mk_node("ident", 1, mk_atom("self"))); }
-| macro_expr { $$ = mk_node("ExprMac", 1, $1); }
-| path_expr '{' struct_expr_fields '}' { $$ = mk_node("ExprStruct", 2, $1, $3); }
-| expr_norange '.' path_generic_args_with_colons { $$ = mk_node("ExprField", 2, $1, $3); }
-| expr_norange '.' LIT_INTEGER { $$ = mk_node("ExprTupleIndex", 1, $1); }
-| expr_norange '[' index_expr ']' { $$ = mk_node("ExprIndex", 2, $1, $3); }
-| expr_norange '(' maybe_exprs ')' { $$ = mk_node("ExprCall", 2, $1, $3); }
-| '(' maybe_exprs ')' { $$ = mk_node("ExprParen", 1, $2); }
-| '[' vec_expr ']' { $$ = mk_node("ExprVec", 1, $2); }
-| CONTINUE { $$ = mk_node("ExprAgain", 0); }
-| CONTINUE ident { $$ = mk_node("ExprAgain", 1, $2); }
-| RETURN { $$ = mk_node("ExprRet", 0); }
-| RETURN expr { $$ = mk_node("ExprRet", 1, $2); }
-| BREAK { $$ = mk_node("ExprBreak", 0); }
-| BREAK ident { $$ = mk_node("ExprBreak", 1, $2); }
-| expr_norange '=' expr_norange { $$ = mk_node("ExprAssign", 2, $1, $3); }
-| expr_norange SHLEQ expr_norange { $$ = mk_node("ExprAssignShl", 2, $1, $3); }
-| expr_norange SHREQ expr_norange { $$ = mk_node("ExprAssignShr", 2, $1, $3); }
-| expr_norange MINUSEQ expr_norange { $$ = mk_node("ExprAssignSub", 2, $1, $3); }
-| expr_norange ANDEQ expr_norange { $$ = mk_node("ExprAssignBitAnd", 2, $1, $3); }
-| expr_norange OREQ expr_norange { $$ = mk_node("ExprAssignBitOr", 2, $1, $3); }
-| expr_norange PLUSEQ expr_norange { $$ = mk_node("ExprAssignAdd", 2, $1, $3); }
-| expr_norange STAREQ expr_norange { $$ = mk_node("ExprAssignMul", 2, $1, $3); }
-| expr_norange SLASHEQ expr_norange { $$ = mk_node("ExprAssignDiv", 2, $1, $3); }
-| expr_norange CARETEQ expr_norange { $$ = mk_node("ExprAssignBitXor", 2, $1, $3); }
-| expr_norange PERCENTEQ expr_norange { $$ = mk_node("ExprAssignRem", 2, $1, $3); }
-| expr_norange OROR expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiOr"), $1, $3); }
-| expr_norange ANDAND expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiAnd"), $1, $3); }
-| expr_norange EQEQ expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiEq"), $1, $3); }
-| expr_norange NE expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiNe"), $1, $3); }
-| expr_norange '<' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiLt"), $1, $3); }
-| expr_norange '>' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiGt"), $1, $3); }
-| expr_norange LE expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiLe"), $1, $3); }
-| expr_norange GE expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiGe"), $1, $3); }
-| expr_norange '|' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiBitOr"), $1, $3); }
-| expr_norange '^' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiBitXor"), $1, $3); }
-| expr_norange '&' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiBitAnd"), $1, $3); }
-| expr_norange SHL expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiShl"), $1, $3); }
-| expr_norange SHR expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiShr"), $1, $3); }
-| expr_norange '+' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiAdd"), $1, $3); }
-| expr_norange '-' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiSub"), $1, $3); }
-| expr_norange '*' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiMul"), $1, $3); }
-| expr_norange '/' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiDiv"), $1, $3); }
-| expr_norange '%' expr_norange { $$ = mk_node("ExprBinary", 3, mk_atom("BiRem"), $1, $3); }
-| expr_norange AS ty { $$ = mk_node("Expr_NorangeCast", 2, $1, $3); }
-| BOX nonparen_expr { $$ = mk_node("ExprBox", 1, $2); }
-| %prec BOXPLACE BOX '(' maybe_expr ')' expr_norange { $$ = mk_node("ExprBox", 2, $3, $5); }
-| block_expr
-| block
-| nonblock_prefix_expr
-;
-
expr_nostruct
: lit { $$ = mk_node("ExprLit", 1, $1); }
| %prec IDENT
| macro_expr { $$ = mk_node("ExprMac", 1, $1); }
| expr_nostruct '.' path_generic_args_with_colons { $$ = mk_node("ExprField", 2, $1, $3); }
| expr_nostruct '.' LIT_INTEGER { $$ = mk_node("ExprTupleIndex", 1, $1); }
-| expr_nostruct '[' index_expr ']' { $$ = mk_node("ExprIndex", 2, $1, $3); }
+| expr_nostruct '[' maybe_expr ']' { $$ = mk_node("ExprIndex", 2, $1, $3); }
| expr_nostruct '(' maybe_exprs ')' { $$ = mk_node("ExprCall", 2, $1, $3); }
| '[' vec_expr ']' { $$ = mk_node("ExprVec", 1, $2); }
| '(' maybe_exprs ')' { $$ = mk_node("ExprParen", 1, $2); }
| expr_nostruct DOTDOT { $$ = mk_node("ExprRange", 2, $1, mk_none()); }
| expr_nostruct DOTDOT expr_nostruct { $$ = mk_node("ExprRange", 2, $1, $3); }
| DOTDOT expr_nostruct { $$ = mk_node("ExprRange", 2, mk_none(), $2); }
+| DOTDOT { $$ = mk_node("ExprRange", 2, mk_none(), mk_none()); }
| expr_nostruct AS ty { $$ = mk_node("ExprCast", 2, $1, $3); }
| BOX nonparen_expr { $$ = mk_node("ExprBox", 1, $2); }
| %prec BOXPLACE BOX '(' maybe_expr ')' expr_nostruct { $$ = mk_node("ExprBox", 1, $3, $5); }
| exprs ';' expr { $$ = mk_node("VecRepeat", 2, $1, $3); }
;
-index_expr
-: expr_norange { $$ = mk_node("Index", 1, $1); }
-| expr_norange DOTDOT { $$ = mk_node("SliceToEnd", 1, $1); }
-| DOTDOT expr_norange { $$ = mk_node("SliceFromBeginning", 1, $2); }
-| expr_norange DOTDOT expr_norange { $$ = mk_node("Slice", 2, $1, $3); }
-| %empty { $$ = mk_none(); }
-;
-
struct_expr_fields
: field_inits
| field_inits ','