autofree: more fixes in optionals

vlib/v/ast/ast.v

@@ -850,6 +850,7 @@ pub:
 	pos   token.Position
 }
 
+/*
 // `or { ... }`
 pub struct OrExpr2 {
 pub:
@@ -858,7 +859,7 @@ pub:
 	kind      OrKind
 	pos       token.Position
 }
-
+*/
 pub struct Assoc {
 pub:
 	var_name string

vlib/v/gen/cgen.v

@@ -1347,12 +1347,13 @@ fn (mut g Gen) gen_assign_stmt(assign_stmt ast.AssignStmt) {
 	// }
 	// int pos = *(int*)_t190.data;
 	mut gen_or := false
+	mut tmp_opt := ''
 	if g.pref.autofree && assign_stmt.op == .decl_assign && assign_stmt.left_types.len == 1 &&
 		assign_stmt.right[0] is ast.CallExpr {
 		call_expr := assign_stmt.right[0] as ast.CallExpr
 		if call_expr.or_block.kind != .absent {
 			styp := g.typ(call_expr.return_type.set_flag(.optional))
-			tmp_opt := g.new_tmp_var()
+			tmp_opt = g.new_tmp_var()
 			g.write('/*AF opt*/$styp $tmp_opt = ')
 			g.expr(assign_stmt.right[0])
 			gen_or = true
@@ -1631,7 +1632,19 @@ fn (mut g Gen) gen_assign_stmt(assign_stmt ast.AssignStmt) {
 			}
 			unwrap_optional := !var_type.has_flag(.optional) && val_type.has_flag(.optional)
 			if unwrap_optional {
+				// Unwrap the optional now that the testing code has been prepended.
+				// `pos := s.index(...
+				// `int pos = *(int)_t10.data;`
 				g.write('*($styp*)')
+				if g.pref.autofree {
+					g.write(tmp_opt + '.data/*FF*/')
+					g.right_is_opt = false
+					g.is_assign_rhs = false
+					if g.inside_ternary == 0 && !assign_stmt.is_simple {
+						g.writeln(';')
+					}
+					return
+				}
 			}
 			g.is_shared = var_type.has_flag(.shared_f)
 			if !cloned {
@@ -1663,8 +1676,12 @@ fn (mut g Gen) gen_assign_stmt(assign_stmt ast.AssignStmt) {
 				}
 			}
 			if unwrap_optional {
+				if g.pref.autofree {
+					// g.write(tmp_opt + '/*FF*/')
+				} else {
 					g.write('.data')
 				}
+			}
 			if str_add {
 				g.write(')')
 			}

vlib/v/gen/fn.v

@@ -554,7 +554,7 @@ fn (mut g Gen) fn_call(node ast.CallExpr) {
 			// g.insert_before_stmt('string $t = $str_expr; // new3. to free $i ')
 			cur_line = g.go_before_stmt(0)
 			// println('cur line ="$cur_line"')
-			g.writeln('string $t = $str_expr; // new3. to free $i ')
+			g.writeln('string $t = $str_expr; // new3. to free arg #$i name=$name')
 			// Now free the tmp arg vars right after the function call
 			g.strs_to_free << 'string_free(&$t);'
 		}