better parser errors

error_test/parser/bracket_errors.sui

@@ -0,0 +1,47 @@
+# Bracket and parenthesis mismatch errors
+
+# Missing closing parenthesis in function call
+fn test() -> int
+    let f = lambda(x) x
+    f(5
+    42
+
+# Missing closing bracket in array access
+fn test() -> int
+    let arr = [1, 2, 3]
+    arr[0
+    42
+
+# Missing closing brace in struct literal
+fn test() -> int
+    struct Point
+        x: int
+        y: int
+    end
+    let p = Point { x: 5, y: 10
+    p.x
+
+# Missing closing parenthesis in tuple
+fn test() -> int
+    let t = (1, 2, 3
+    42
+
+# Missing closing angle bracket in generic
+fn test() -> int
+    let v = Vec<int
+    42
+
+# Extra closing parenthesis
+fn test() -> int
+    let x = (5))
+    x
+
+# Mismatched brackets
+fn test() -> int
+    let x = [1, 2, 3}
+    x[0]
+
+# Missing opening parenthesis in expression
+fn test() -> int
+    let x = 5 + 3)
+    x