Auto merge of #16852 - servo:illegal_floating_point_literal_pattern, r=jdm+SimonSapin

Fix illegal_floating_point_literal_pattern again and rustup…

… to compiler that has it, to avoid regressing again.

Upgrade to (rustc 1.19.0-nightly (e17a1227a 2017-05-12)

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components/style/properties/gecko.mako.rs

@@ -1660,11 +1660,7 @@ fn static_assert() {
 
     pub fn clone_font_size_adjust(&self) -> longhands::font_size_adjust::computed_value::T {
         use properties::longhands::font_size_adjust::computed_value::T;
-
-        match self.gecko.mFont.sizeAdjust {
-            -1.0 => T::None,
-            _ => T::Number(self.gecko.mFont.sizeAdjust),
-        }
+        T::from_gecko_adjust(self.gecko.mFont.sizeAdjust)
     }
 
     #[allow(non_snake_case)]

components/style/properties/longhand/font.mako.rs

@@ -1064,9 +1064,10 @@ ${helpers.single_keyword_system("font-variant-caps",
 
         impl T {
             pub fn from_gecko_adjust(gecko: f32) -> Self {
-                match gecko {
-                    -1.0 => T::None,
-                    _ => T::Number(gecko),
+                if gecko == -1.0 {
+                    T::None
+                } else {
+                    T::Number(gecko)
                 }
             }
         }