fix: prevent prefix semicolon insertion for increment and decrement (#…

…648)

src/generation/generate.rs

@@ -4688,6 +4688,9 @@ fn gen_expr_stmt<'a>(stmt: &ExprStmt<'a>, context: &mut Context<'a>) -> PrintIte
         for item in PrintItemsIterator::new(path) {
           match item {
             PrintItem::String(value) => {
+              if value.text.starts_with("++") || value.text.starts_with("--") {
+                return Some(false); // don't need to add for increment/decrement
+              }
               if let Some(c) = value.text.chars().next() {
                 return utils::is_prefix_semi_colon_insertion_char(c).into();
               }

tests/specs/statements/expressionStatement/ExpressionStatement_SemiColonInsertion.txt

@@ -22,3 +22,31 @@
 
 [expect]
 ;[1, 2, 3].forEach(bar)
+
+== shouldn't insert semi-colons at the start of lines beginning with increment ==
+let x =   0
+   ++x
+
+[expect]
+let x = 0
+++x
+
+== shouldn't insert semi-colons at the start of lines beginning with decrement ==
+let x =   0
+   --x
+
+[expect]
+let x = 0
+--x
+
+== should insert semi-colons at the start of lines beginning with a single plus operator ==
+   +5
+
+[expect]
+;+5
+
+== should insert semi-colons at the start of lines beginning with with a single subtract operator ==
+   -5
+
+[expect]
+;-5