patch 8.2.0972: Vim9 script variable declarations need a type
Problem: Vim9 script variable declarations need a type.
Solution: Make "let var: type" declare a script-local variable.
diff --git a/src/vim9script.c b/src/vim9script.c
index ca14702..51afa19 100644
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -434,4 +434,59 @@
return cmd_end;
}
+/*
+ * Declare a script-local variable without init: "let var: type".
+ * "const" is an error since the value is missing.
+ * Returns a pointer to after the type.
+ */
+ char_u *
+vim9_declare_scriptvar(exarg_T *eap, char_u *arg)
+{
+ char_u *p;
+ char_u *name;
+ scriptitem_T *si = SCRIPT_ITEM(current_sctx.sc_sid);
+ type_T *type;
+ int called_emsg_before = called_emsg;
+ typval_T init_tv;
+
+ if (eap->cmdidx == CMD_const)
+ {
+ emsg(_(e_const_req_value));
+ return arg + STRLEN(arg);
+ }
+
+ // Check for valid starting character.
+ if (!eval_isnamec1(*arg))
+ {
+ semsg(_(e_invarg2), arg);
+ return arg + STRLEN(arg);
+ }
+
+ for (p = arg + 1; *p != NUL && *p != ':' && eval_isnamec(*p);
+ MB_PTR_ADV(p))
+ ;
+
+ if (*p != ':')
+ {
+ emsg(_(e_type_req));
+ return arg + STRLEN(arg);
+ }
+ name = vim_strnsave(arg, p - arg);
+
+ // parse type
+ p = skipwhite(p + 1);
+ type = parse_type(&p, &si->sn_type_list);
+ if (called_emsg != called_emsg_before)
+ return p;
+
+ // Create the variable with 0/NULL value.
+ CLEAR_FIELD(init_tv);
+ init_tv.v_type = type->tt_type;
+ set_var_const(name, type, &init_tv, FALSE, 0);
+
+ vim_free(name);
+ return p;
+}
+
+
#endif // FEAT_EVAL