bugfix257 Reinitialize linter for each file.

- I've called this Option3 in the comments of dalance#257.
- Clone of `config` might be avoided, but this is the lowest-effort change.

src/main.rs

@@ -200,11 +200,6 @@ pub fn run_opt_config(printer: &mut Printer, opt: &Opt, config: Config) -> Resul
         not_obsolete = false;
     }
 
-    let mut linter = Linter::new(config);
-    for plugin in &opt.plugins {
-        linter.load(&plugin)?;
-    }
-
     let mut defines = HashMap::new();
     for define in &opt.defines {
         let mut define = define.splitn(2, '=');
@@ -265,12 +260,17 @@ pub fn run_opt_config(printer: &mut Printer, opt: &Opt, config: Config) -> Resul
                 }
             }
         } else {
-            // Iterate over lines in the file, applying each textrule to each
-            // line in turn.
 
-            let text: String = read_to_string(&path)?;
+            let mut linter = Linter::new(config.clone());
+            for plugin in &opt.plugins {
+                linter.load(&plugin)?;
+            }
 
+            let text: String = read_to_string(&path)?;
             let mut beg: usize = 0;
+
+            // Iterate over lines in the file, applying each textrule to each
+            // line in turn.
             for line in text.split_inclusive('\n') {
                 let line_stripped = line.trim_end_matches(&['\n', '\r']);
 
@@ -285,9 +285,9 @@ pub fn run_opt_config(printer: &mut Printer, opt: &Opt, config: Config) -> Resul
 
             match parse_sv_str(text.as_str(), &path, &defines, &includes, opt.ignore_include, false) {
                 Ok((syntax_tree, new_defines)) => {
+
                     // Iterate over nodes in the concrete syntax tree, applying
                     // each syntaxrule to each node in turn.
-
                     for node in syntax_tree.into_iter().event() {
                         for failed in linter.syntaxrules_check(&syntax_tree, &node) {
                             pass = false;