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Author: mattn

autoload/lsp/client.vim

@@ -240,6 +240,11 @@ function! s:lsp_is_error(obj_or_response) abort
     return has_key(a:obj_or_response, 'error')
 endfunction
 
+function! s:lsp_is_error(obj_or_response) abort
+    return has_key(a:obj_or_response, 'error')
+endfunction
+
+
 function! s:is_server_instantiated_notification(notification) abort
     return !has_key(a:notification, 'request')
 endfunction
@@ -270,6 +275,18 @@ function! lsp#client#is_error(obj_or_response) abort
     return s:lsp_is_error(a:obj_or_response)
 endfunction
 
+function! lsp#client#error_message(obj_or_response) abort
+    try
+        return a:obj_or_response['error']['data']['message']
+    catch
+    endtry
+    try
+        return a:obj_or_response['error']['message']
+    catch
+    endtry
+    return string(a:obj_or_response)
+endfunction
+
 function! lsp#client#is_server_instantiated_notification(notification) abort
     return s:is_server_instantiated_notification(a:notification)
 endfunction

autoload/lsp/ui/vim.vim

@@ -298,7 +298,7 @@ function! s:handle_symbol(server, last_req_id, type, data) abort
     endif
 
     if lsp#client#is_error(a:data['response'])
-        call lsp#utils#error('Failed to retrieve '. a:type . ' for ' . a:server)
+        call lsp#utils#error('Failed to retrieve '. a:type . ' for ' . a:server . ': ' . lsp#client#error_message(a:data['response']))
         return
     endif
 
@@ -322,7 +322,7 @@ function! s:handle_location(ctx, server, type, data) abort "ctx = {counter, list
     let a:ctx['counter'] = a:ctx['counter'] - 1
 
     if lsp#client#is_error(a:data['response'])
-        call lsp#utils#error('Failed to retrieve '. a:type . ' for ' . a:server)
+        call lsp#utils#error('Failed to retrieve '. a:type . ' for ' . a:server . ': ' . lsp#client#error_message(a:data['response']))
     else
         let a:ctx['list'] = a:ctx['list'] + lsp#ui#vim#utils#locations_to_loc_list(a:data)
     endif
@@ -353,8 +353,8 @@ function! s:handle_workspace_edit(server, last_req_id, type, data) abort
         return
     endif
 
-    if lsp#client#is_error(a:data)
-        call lsp#utils#error('Failed to retrieve '. a:type . ' for ' . a:server)
+    if lsp#client#is_error(a:data['response'])
+        call lsp#utils#error('Failed to retrieve '. a:type . ' for ' . a:server . ': ' . lsp#client#error_message(a:data['response']))
         return
     endif
 
@@ -369,7 +369,7 @@ function! s:handle_text_edit(server, last_req_id, type, data) abort
     endif
 
     if lsp#client#is_error(a:data['response'])
-        call lsp#utils#error('Failed to '. a:type . ' for ' . a:server)
+        call lsp#utils#error('Failed to '. a:type . ' for ' . a:server . ': ' . lsp#client#error_message(a:data['response']))
         return
     endif