Insert semicolons between lines that JS would combine

Fixes DanielXMoore#272.
Adds some extra semicolons, as it is based on input instead of generated code.

source/parser.hera

@@ -3575,6 +3575,10 @@ ExpressionDelimiter
 
 StatementDelimiter
   SemicolonDelimiter
+  # NOTE: Avoid automatic continuation onto lines that start with
+  # certain characters by adding an explicit semicolon.  See
+  # https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar#automatic_semicolon_insertion
+  &( Samedent [\(\[`\+\-\*\/] ) InsertSemicolon
   &EOS
 
 SemicolonDelimiter
@@ -4788,6 +4792,10 @@ Debugger
 
 # Insertions
 
+InsertSemicolon
+  "" ->
+    return { $loc, token: ";" }
+
 InsertOpenParen
   "" ->
     return { $loc, token: "(" }

test/autolet.civet

@@ -66,8 +66,8 @@ describe "auto let with multiple declaration", ->
         [a, b] = [1, 2]
         [c, d] = [3, 4]
         ---
-        let c = "str"
-        let [a, b] = [1, 2]
+        let c = "str";
+        let [a, b] = [1, 2];
         let d
         [c, d] = [3, 4]
     """

test/call-expression.civet

@@ -147,3 +147,24 @@ describe "call-expression", ->
       data!
       .map((x) => x + 1)
     """
+
+  describe "insert semicolons to prevent accidental calls", ->
+    testCase """
+      parenthetical
+      ---
+      x
+      (z)
+      ---
+      x;
+      (z)
+    """
+
+    testCase """
+      arrow function
+      ---
+      x
+      (z) => z
+      ---
+      x;
+      (z) => z
+    """

test/chained-comparisons.civet

@@ -57,7 +57,7 @@ describe "chained comparisons", ->
     (a < b) < c
     (a + b) < (c + d) < (e + f)
     ---
-    (a < b) < c
+    (a < b) < c;
     (a + b) < (c + d) && (c + d) < (e + f)
   """
 

test/function.civet

@@ -263,7 +263,7 @@ describe "function", ->
     () => x
     (x) => x
     ---
-    () => x
+    () => x;
     (x) => x
   """
 
@@ -617,7 +617,7 @@ describe "function", ->
       (x) => x+a
     ---
     function test(a) {
-      a = simplify(a)
+      a = simplify(a);
       return (x) => x+a
     }
   """

test/jsx/indent.civet

@@ -472,7 +472,7 @@ describe "Unbraced function children in JSX", ->
       `[${priority}] ${item}`
     ---
     <For each={items}>{(item) => {
-      const {priority, text} = item
+      const {priority, text} = item;
       return `[${priority}] ${item}`
     }}
     </For>

test/parentheses.civet

@@ -31,6 +31,6 @@ describe "parentheses", ->
     a
     /** @type Y */ (x)
     ---
-    a
+    a;
     /** @type Y */ (x)
   """

test/types/function.civet

@@ -18,7 +18,7 @@ describe "[TS] function", ->
     () : number => x
     (x) : number => x
     ---
-    () : number => x
+    () : number => x;
     (x) : number => x
   """