[CS2] Throw an error for ambiguous get or set keywords or function calls

src/lexer.coffee

@@ -170,6 +170,8 @@ exports.Lexer = class Lexer
        isForFrom(prev)
       tag = 'FORFROM'
       @seenFor = no
+    else if tag is 'PROPERTY' and prev and prev.spaced and prev[0] in CALLABLE and /^[g|s]et$/.test(prev[1])
+      @error "'#{prev[1]}' cannot be used as a keyword, or as a function call without parentheses", prev[2]
 
     if tag is 'IDENTIFIER' and id in RESERVED
       @error "reserved word '#{id}'", length: id.length

src/nodes.coffee

@@ -764,7 +764,7 @@ exports.Call = class Call extends Base
   constructor: (@variable, @args = [], @soak) ->
     super()
 
-    @isNew    = false
+    @isNew = no
     if @variable instanceof Value and @variable.isNotCallable()
       @variable.error "literal is not a function"
 

test/error_messages.coffee

@@ -1340,3 +1340,119 @@ test "new with 'super'", ->
     class extends A then foo: -> new super()
                                      ^^^^^
   '''
+
+test "getter keyword in object", ->
+  assertErrorFormat '''
+    obj =
+      get foo: ->
+  ''', '''
+    [stdin]:2:3: error: 'get' cannot be used as a keyword, or as a function call without parentheses
+      get foo: ->
+      ^^^
+  '''
+
+test "setter keyword in object", ->
+  assertErrorFormat '''
+    obj =
+      set foo: ->
+  ''', '''
+    [stdin]:2:3: error: 'set' cannot be used as a keyword, or as a function call without parentheses
+      set foo: ->
+      ^^^
+  '''
+
+test "getter keyword in inline implicit object", ->
+  assertErrorFormat 'obj = get foo: ->', '''
+    [stdin]:1:7: error: 'get' cannot be used as a keyword, or as a function call without parentheses
+    obj = get foo: ->
+          ^^^
+  '''
+
+test "setter keyword in inline implicit object", ->
+  assertErrorFormat 'obj = set foo: ->', '''
+    [stdin]:1:7: error: 'set' cannot be used as a keyword, or as a function call without parentheses
+    obj = set foo: ->
+          ^^^
+  '''
+
+test "getter keyword in inline explicit object", ->
+  assertErrorFormat 'obj = {get foo: ->}', '''
+    [stdin]:1:8: error: 'get' cannot be used as a keyword, or as a function call without parentheses
+    obj = {get foo: ->}
+           ^^^
+  '''
+
+test "setter keyword in inline explicit object", ->
+  assertErrorFormat 'obj = {set foo: ->}', '''
+    [stdin]:1:8: error: 'set' cannot be used as a keyword, or as a function call without parentheses
+    obj = {set foo: ->}
+           ^^^
+  '''
+
+test "getter keyword in function", ->
+  assertErrorFormat '''
+    f = ->
+      get foo: ->
+  ''', '''
+    [stdin]:2:3: error: 'get' cannot be used as a keyword, or as a function call without parentheses
+      get foo: ->
+      ^^^
+  '''
+
+test "setter keyword in function", ->
+  assertErrorFormat '''
+    f = ->
+      set foo: ->
+  ''', '''
+    [stdin]:2:3: error: 'set' cannot be used as a keyword, or as a function call without parentheses
+      set foo: ->
+      ^^^
+  '''
+
+test "getter keyword in inline function", ->
+  assertErrorFormat 'f = -> get foo: ->', '''
+    [stdin]:1:8: error: 'get' cannot be used as a keyword, or as a function call without parentheses
+    f = -> get foo: ->
+           ^^^
+  '''
+
+test "setter keyword in inline function", ->
+  assertErrorFormat 'f = -> set foo: ->', '''
+    [stdin]:1:8: error: 'set' cannot be used as a keyword, or as a function call without parentheses
+    f = -> set foo: ->
+           ^^^
+  '''
+
+test "getter keyword in class", ->
+  assertErrorFormat '''
+    class A
+      get foo: ->
+  ''', '''
+    [stdin]:2:3: error: 'get' cannot be used as a keyword, or as a function call without parentheses
+      get foo: ->
+      ^^^
+  '''
+
+test "setter keyword in class", ->
+  assertErrorFormat '''
+    class A
+      set foo: ->
+  ''', '''
+    [stdin]:2:3: error: 'set' cannot be used as a keyword, or as a function call without parentheses
+      set foo: ->
+      ^^^
+  '''
+
+test "getter keyword in inline class", ->
+  assertErrorFormat 'class A then get foo: ->', '''
+      [stdin]:1:14: error: 'get' cannot be used as a keyword, or as a function call without parentheses
+      class A then get foo: ->
+                   ^^^
+  '''
+
+test "setter keyword in inline class", ->
+  assertErrorFormat 'class A then set foo: ->', '''
+      [stdin]:1:14: error: 'set' cannot be used as a keyword, or as a function call without parentheses
+      class A then set foo: ->
+                   ^^^
+  '''

test/function_invocation.coffee

@@ -675,7 +675,7 @@ test "Non-callable literals shouldn't compile", ->
   cantCompile '[1..10][2..9] 2'
   cantCompile '[1..10][2..9](2)'
 
-test 'implicit invocation with implicit object literal', ->
+test "implicit invocation with implicit object literal", ->
   f = (obj) -> eq 1, obj.a
 
   f
@@ -706,3 +706,41 @@ test 'implicit invocation with implicit object literal', ->
     else
       "#{a}": 1
   eq 2, obj.a
+
+test "get and set can be used as function names when not ambiguous with `get`/`set` keywords", ->
+  get = (val) -> val
+  set = (val) -> val
+  eq 2, get(2)
+  eq 3, set(3)
+
+  get = ({val}) -> val
+  set = ({val}) -> val
+  eq 4, get({val: 4})
+  eq 5, set({val: 5})
+
+test "get and set can be used as variable and property names", ->
+  get = 2
+  set = 3
+  eq 2, get
+  eq 3, set
+
+  {get} = {get: 4}
+  {set} = {set: 5}
+  eq 4, get
+  eq 5, set
+
+test "get and set can be used as class method names", ->
+  class A
+    get: -> 2
+    set: -> 3
+
+  a = new A()
+  eq 2, a.get()
+  eq 3, a.set()
+
+  class B
+    @get = -> 4
+    @set = -> 5
+
+  eq 4, B.get()
+  eq 5, B.set()