Updated plugins, also experimenting with a new font

The font is IBM Plex Mono: https://ibm.github.io/type/

sources_non_forked/syntastic/autoload/syntastic/postprocess.vim

@@ -65,6 +65,17 @@ function! syntastic#postprocess#guards(errors) abort " {{{2
     return a:errors
 endfunction " }}}2
 
+" convert error messages from UTF-8 to the current encoding
+function! syntastic#postprocess#iconv(errors) abort " {{{2
+    if has('iconv') && &encoding !=# '' && &encoding !=# 'utf-8'
+        for e in a:errors
+            let e['text'] = iconv(e['text'], "utf-8", &encoding)
+        endfor
+    endif
+
+    return a:errors
+endfunction " }}}2
+
 " }}}1
 
 let &cpo = s:save_cpo

sources_non_forked/syntastic/autoload/syntastic/preprocess.vim

@@ -264,6 +264,43 @@ function! syntastic#preprocess#perl(errors) abort " {{{2
     return syntastic#util#unique(out)
 endfunction " }}}2
 
+function! syntastic#preprocess#perl6(errors) abort " {{{2
+    if a:errors[0] ==# 'Syntax OK'
+        return []
+    endif
+
+    let errs = s:_decode_JSON(join(a:errors, ''))
+
+    let out = []
+    if type(errs) == type({})
+        try
+            for val in values(errs)
+                let line = get(val, 'line', 0)
+                let pos = get(val, 'pos', 0)
+                if pos && has('byte_offset')
+                    let line_pos = byte2line(pos + 1)
+                    let column = line_pos > 0 ? pos - line2byte(line_pos) + 2 : 0
+                else
+                    let column = 0
+                endif
+
+                call add(out, join([
+                    \ get(val, 'filename', ''),
+                    \ line,
+                    \ column,
+                    \ get(val, 'message', '') ], ':'))
+            endfor
+        catch /\m^Vim\%((\a\+)\)\=:E716/
+            call syntastic#log#warn('checker perl6/perl6: unrecognized error item ' . string(val))
+            let out = []
+        endtry
+    else
+        call syntastic#log#warn('checker perl6/perl6: unrecognized error format')
+    endif
+
+    return out
+endfunction " }}}2
+
 function! syntastic#preprocess#prospector(errors) abort " {{{2
     let errs = join(a:errors, '')
     if errs ==# ''

sources_non_forked/syntastic/autoload/syntastic/util.vim

@@ -253,7 +253,7 @@ endfunction " }}}2
 function! syntastic#util#findFileInParent(what, where) abort " {{{2
     let old_suffixesadd = &suffixesadd
     let &suffixesadd = ''
-    let file = findfile(a:what, escape(a:where, ' ') . ';')
+    let file = findfile(a:what, escape(a:where, ' ,') . ';')
     let &suffixesadd = old_suffixesadd
     return file
 endfunction " }}}2
@@ -307,8 +307,14 @@ function! syntastic#util#fname2buf(fname) abort " {{{2
 
     " this is a best-effort attempt to escape file patterns (cf. :h file-pattern)
     " XXX it fails for filenames containing something like \{2,3}
+    let buf = -1
     for md in [':~:.', ':~', ':p']
-        let buf = bufnr('^' . escape(fnamemodify(a:fname, md), '\*?,{}[') . '$')
+        try
+            " Older versions of Vim can throw E94 here
+            let buf = bufnr('^' . escape(fnamemodify(a:fname, md), '\*?,{}[') . '$')
+        catch
+            " catch everything
+        endtry
         if buf != -1
             break
         endif