conditional optional unwrapping

compiler/parser/parser.odin

@@ -1079,6 +1079,18 @@ parse_if :: proc(parser: ^Parser) -> ast.Stmt_Id {
 	parser.no_struct_literal = true
 	condition := parse_expression(parser)
 	parser.no_struct_literal = saved
+	binding := symbol.INVALID
+	if _, ok := allow(parser, .Pipe); ok {
+		name_tok, name_ok := allow(parser, .Identifier)
+		if name_ok {
+			binding = name_tok.symbol
+		} else {
+			source.add(parser.diagnostics, current(parser).span, "expected a binding name after '|'")
+		}
+		if _, close_ok := allow(parser, .Pipe); !close_ok {
+			source.add(parser.diagnostics, current(parser).span, "expected '|' to close the unwrap binding")
+		}
+	}
 	skip_newlines(parser)
 	then_body := parse_block(parser)
 	else_body: []ast.Stmt_Id = nil
@@ -1102,6 +1114,7 @@ parse_if :: proc(parser: ^Parser) -> ast.Stmt_Id {
 	append(&parser.module.statements, ast.Stmt{
 		kind=.If,
 		span=span_from(start.span, previous(parser).span),
+		name=binding,
 		expr=condition,
 		body=then_body,
 		else_body=else_body,