fix and changelog

Author: zth

CHANGELOG.md

@@ -31,6 +31,7 @@
 #### :nail_care: Polish
 
 - Add (dev-)dependencies to build schema. https://github.com/rescript-lang/rescript/pull/7892
+- Dedicated error for dict literal spreads. https://github.com/rescript-lang/rescript/pull/7901
 
 #### :house: Internal
 

compiler/syntax/src/res_core.ml

@@ -3373,6 +3373,7 @@ and parse_dict_expr_row p =
   | DotDotDot ->
     Parser.err p (Diagnostics.message ErrorMessages.dict_expr_spread);
     Parser.next p;
+    (* Parse the expr so it's consumed *)
     let _spread_expr = parse_constrained_or_coerced_expr p in
     None
   | String s -> (

tests/syntax_tests/data/parsing/errors/other/dict_spread.res

@@ -1,2 +1,2 @@
-let x = dict{...foo}
+let x = dict{...foo, "bar": 3}
 

tests/syntax_tests/data/parsing/errors/other/expected/dict_spread.res.txt

@@ -2,10 +2,10 @@
   Syntax error!
   syntax_tests/data/parsing/errors/other/dict_spread.res:1:14-16
 
-  1 │ let x = dict{...foo}
+  1 │ let x = dict{...foo, "bar": 3}
   2 │ 
   3 │ 
 
   Dict literals do not support spread (`...`) yet.
 
-let x = Primitive_dict.make [||]
+let x = Primitive_dict.make [|("bar", 3)|]