Auto merge of #29902 - huonw:smart-quotes, r=alexcrichton

cc https://github.com/rust-lang/rust/pull/29837#issuecomment-157540449

src/libsyntax/parse/lexer/unicode_chars.rs

@@ -91,6 +91,22 @@ const UNICODE_ARRAY: &'static [(char, &'static str, char)] = &[
     ('י', "Hebrew Letter Yod", '\''),
     ('ߴ', "Nko High Tone Apostrophe", '\''),
     ('ߵ', "Nko Low Tone Apostrophe", '\''),
+    ('＂', "Fullwidth Quotation Mark", '"'),
+    ('“', "Left Double Quotation Mark", '"'),
+    ('”', "Right Double Quotation Mark", '"'),
+    ('‟', "Double High-Reversed-9 Quotation Mark", '"'),
+    ('″', "Double Prime", '"'),
+    ('‶', "Reversed Double Prime", '"'),
+    ('〃', "Ditto Mark", '"'),
+    ('״', "Hebrew Punctuation Gershayim", '"'),
+    ('˝', "Double Acute Accent", '"'),
+    ('ʺ', "Modifier Letter Double Prime", '"'),
+    ('˶', "Modifier Letter Middle Double Acute Accent", '"'),
+    ('˵', "Modifier Letter Middle Double Grave Accent", '"'),
+    ('ˮ', "Modifier Letter Double Apostrophe", '"'),
+    ('ײ', "Hebrew Ligature Yiddish Double Yod", '"'),
+    ('❞', "Heavy Double Comma Quotation Mark Ornament", '"'),
+    ('❝', "Heavy Double Turned Comma Quotation Mark Ornament", '"'),
     ('［', "Fullwidth Left Square Bracket", '('),
     ('❨', "Medium Left Parenthesis Ornament", '('),
     ('❲', "Light Left Tortoise Shell Bracket Ornament", '('),
@@ -149,6 +165,7 @@ const ASCII_ARRAY: &'static [(char, &'static str)] = &[
     ('?', "Question Mark"),
     ('.', "Period"),
     ('\'', "Single Quote"),
+    ('"', "Quotation Mark"),
     ('(', "Left Parenthesis"),
     (')', "Right Parenthesis"),
     ('{', "Left Curly Brace"),