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patch 9.1.1801: Vim9: misleading error when extending dictionary

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Problem:  Vim9: misleading error when extending dictionary
          (lacygoill)
Solution: Give a proper error message when a Dict type is used with a
          compound operator (Yegappan Lakshmanan)

fixes: #8072
closes: #18426

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Yegappan Lakshmanan
2025-09-28 17:17:37 +00:00
committed by Christian Brabandt
parent d35e5e4237
commit ad43d2639d
3 changed files with 43 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
src/vim9compile.c
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@ -3438,6 +3438,27 @@ compile_assign_rhs(cctx_T *cctx, cac_T *cac)
&cac->cac_skip_store);
}
/*
* Returns OK if "type" supports compound operator "op_arg" (e.g. +=, -=, %=,
* etc.). Compound operators are not supported with a tuple and a dict.
* Returns FAIL if compound operator is not supported.
*/
static int
check_type_supports_compound_op(type_T *type, char_u op_arg)
{
if (type->tt_type == VAR_TUPLE || type->tt_type == VAR_DICT)
{
char_u op[2];
op[0] = op_arg;
op[1] = NUL;
semsg(_(e_wrong_variable_type_for_str_equal), op);
return FAIL;
}
return OK;
}
/*
* Compile a compound op assignment statement (+=, -=, *=, %=, etc.)
*/
@ -3448,16 +3469,10 @@ compile_assign_compound_op(cctx_T *cctx, cac_T *cac)
type_T *expected;
type_T *stacktype = NULL;
if (cac->cac_lhs.lhs_type->tt_type == VAR_TUPLE)
{
// compound operators are not supported with a tuple
char_u op[2];
op[0] = *cac->cac_op;
op[1] = NUL;
semsg(_(e_wrong_variable_type_for_str_equal), op);
if (cac->cac_lhs.lhs_type->tt_type == VAR_TUPLE
&& check_type_supports_compound_op(cac->cac_lhs.lhs_type,
*cac->cac_op) == FAIL)
return FAIL;
}
if (*cac->cac_op == '.')
{
@ -3474,6 +3489,10 @@ compile_assign_compound_op(cctx_T *cctx, cac_T *cac)
{
expected = lhs->lhs_member_type;
stacktype = get_type_on_stack(cctx, 0);
if (check_type_supports_compound_op(expected, *cac->cac_op) == FAIL)
return FAIL;
if (
// If variable is float operation with number is OK.
!(expected == &t_float && (stacktype == &t_number