Fix precedence of prefix expressions vs nav expressions

Fixes #272

grammar.js

@@ -28,7 +28,6 @@ const PRECS = {
  infix_operations: 9,
  nil_coalescing: 8,
  check: 7,
- prefix_operations: 7,
  comparison: 6,
  postfix_operations: 6,
  equality: 5,
@@ -55,6 +54,7 @@ const PRECS = {
  range_suffix: -2,
  ternary_binary_suffix: -2,
  await: -2,
+ prefix_operations: -2,
  assignment: -3,
  comment: -3,
  lambda: -3,
@@ -512,7 +512,7 @@ module.exports = grammar({
  )
  ),
  navigation_expression: ($) =>
- prec.left(
+ prec.right(
  PRECS.navigation,
  seq(
  field("target", choice($._navigable_type_expression, $._expression)),

test/corpus/expressions.txt

@@ -1217,3 +1217,24 @@ foo()
  (call_suffix
  (value_arguments)))
  (fully_open_range))
+
+================================================================================
+Negated prefix expressions
+================================================================================
+let test = !Enum.case.variable
+
+--------------------------------------------------------------------------------
+
+(source_file
+ (property_declaration
+ (pattern
+ (simple_identifier))
+ (prefix_expression
+ (bang)
+ (navigation_expression
+ (navigation_expression
+ (simple_identifier)
+ (navigation_suffix
+ (simple_identifier)))
+ (navigation_suffix
+ (simple_identifier))))))