Fix to parse regex in default argument (#5481)

makenowjust · RX14 · commit 856220c8137c · 2018-01-02T00:39:34.000Z
diff --git a/spec/compiler/parser/parser_spec.cr b/spec/compiler/parser/parser_spec.cr
@@ -867,6 +867,7 @@ describe "Parser" do
   it_parses "a()/3", Call.new("a".call, "/", 3.int32)
   it_parses "a() /3", Call.new("a".call, "/", 3.int32)
   it_parses "a.b() /3", Call.new(Call.new("a".call, "b"), "/", 3.int32)
+  it_parses "def foo(x = / /); end", Def.new("foo", [Arg.new("x", regex(" "))])
 
   it_parses "1 =~ 2", Call.new(1.int32, "=~", 2.int32)
   it_parses "1.=~(2)", Call.new(1.int32, "=~", 2.int32)
diff --git a/src/compiler/crystal/syntax/parser.cr b/src/compiler/crystal/syntax/parser.cr
@@ -3446,6 +3446,7 @@ module Crystal
         raise "splat argument can't have default value", @token if splat
         raise "double splat argument can't have default value", @token if double_splat
 
+        slash_is_regex!
         next_token_skip_space_or_newline
 
         case @token.type
