Repository: http4s/http4s (scala)

Issue:
`Uri.uri` macro fails with symbol named org
Well, this is sad.

``` scala
scala> import org.http4s._

scala> Uri.uri("http://www.example.com/")
res0: org.http4s.Uri = http://www.example.com

scala> val bar = "bar"
bar: String = bar

scala> Uri.uri("http://www.example.com/") / bar
res1: org.http4s.Uri = http://www.example.com/bar

scala> val org = "foo"
org: String = foo

scala> Uri.uri("http://www.example.com/") / org
<console>:16: error: value http4s is not a member of String
       Uri.uri("http://www.example.com/") / org
              ^
```

Pull request description:
without the `_root_` in the uri macro, the added test fails to compile with `error: value http4s is not a member of String`

This issue was originally fixed in #741, but in the intervening years + refactors the `_root_` qualifier was dropped. I'm just re-adding it, and I'm adding it to all the literal macros just to be safe. 

fixes #704

Patch:
diff --git a/core/shared/src/main/scala-2/org/http4s/LiteralSyntaxMacros.scala b/core/shared/src/main/scala-2/org/http4s/LiteralSyntaxMacros.scala
index 17438197842..7d30d462d42 100644
--- a/core/shared/src/main/scala-2/org/http4s/LiteralSyntaxMacros.scala
+++ b/core/shared/src/main/scala-2/org/http4s/LiteralSyntaxMacros.scala
@@ -24,7 +24,7 @@ object LiteralSyntaxMacros {
     def validate(c: Context)(s: String): Either[String, c.Expr[Uri]] = {
       import c.universe._
       Uri.fromString(s) match {
-        case Right(_) => Right(c.Expr(q"org.http4s.Uri.unsafeFromString($s)"))
+        case Right(_) => Right(c.Expr(q"_root_.org.http4s.Uri.unsafeFromString($s)"))
         case Left(parseError) => Left(s"invalid URI: ${parseError.details}")
       }
     }
@@ -34,7 +34,7 @@ object LiteralSyntaxMacros {
   object path extends Literally[Uri.Path] {
     def validate(c: Context)(s: String): Either[String, c.Expr[Uri.Path]] = {
       import c.universe._
-      Right(c.Expr(q"org.http4s.Uri.Path.unsafeFromString($s)"))
+      Right(c.Expr(q"_root_.org.http4s.Uri.Path.unsafeFromString($s)"))
     }
     def make(c: Context)(args: c.Expr[Any]*): c.Expr[Uri.Path] = apply(c)(args: _*)
   }
@@ -43,7 +43,7 @@ object LiteralSyntaxMacros {
     def validate(c: Context)(s: String): Either[String, c.Expr[Uri.Scheme]] = {
       import c.universe._
       Uri.Scheme.fromString(s) match {
-        case Right(_) => Right(c.Expr(q"org.http4s.Uri.Scheme.unsafeFromString($s)"))
+        case Right(_) => Right(c.Expr(q"_root_.org.http4s.Uri.Scheme.unsafeFromString($s)"))
         case Left(pf) => Left(s"invalid Scheme: ${pf.details}")
       }
     }
@@ -54,7 +54,7 @@ object LiteralSyntaxMacros {
     def validate(c: Context)(s: String): Either[String, c.Expr[MediaType]] = {
       import c.universe._
       MediaType.parse(s) match {
-        case Right(_) => Right(c.Expr(q"org.http4s.MediaType.unsafeParse($s)"))
+        case Right(_) => Right(c.Expr(q"_root_.org.http4s.MediaType.unsafeParse($s)"))
         case Left(pf) => Left(s"invalid MediaType: ${pf.details}")
       }
     }
@@ -65,7 +65,7 @@ object LiteralSyntaxMacros {
     def validate(c: Context)(s: String): Either[String, c.Expr[QValue]] = {
       import c.universe._
       QValue.fromString(s) match {
-        case Right(_) => Right(c.Expr(q"org.http4s.QValue.unsafeFromString($s)"))
+        case Right(_) => Right(c.Expr(q"_root_.org.http4s.QValue.unsafeFromString($s)"))
         case Left(pf) => Left(s"invalid QValue: ${pf.details}")
       }
     }


Test patch:
diff --git a/tests/shared/src/test/scala/org/http4s/LiteralSyntaxMacrosSuite.scala b/tests/shared/src/test/scala/org/http4s/LiteralSyntaxMacrosSuite.scala
index ccfa2a51c74..eb470ee90e6 100644
--- a/tests/shared/src/test/scala/org/http4s/LiteralSyntaxMacrosSuite.scala
+++ b/tests/shared/src/test/scala/org/http4s/LiteralSyntaxMacrosSuite.scala
@@ -18,10 +18,20 @@ package org.http4s
 
 import org.http4s.implicits._
 
+import scala.annotation.nowarn
+
 class LiteralSyntaxMacrosSuite extends Http4sSuite {
   test("'uri' macro works for valid input") {
     assertEquals(uri"a.b.c", Uri.fromString("a.b.c").toOption.get)
   }
+  test("'uri' macro works with variable named 'org'") {
+    val org = "blerf"
+    assertEquals(uri"org" / org, Uri.fromString("org/blerf").toOption.get)
+  }
+  test("'uri' macro works with implicit variable named 'org' in scope") {
+    @nowarn implicit val org = "the-problem"
+    assertEquals(uri"example", Uri.fromString("example").toOption.get)
+  }
   test("invalid uri won't compile") {
     assert(
       compileErrors {