Test cases for false multiline delimiters

Author: maustinstar

test/Parse/raw_string.swift

@@ -68,6 +68,37 @@ _ = ##"""
       """##
 // CHECK: "a raw string with \"\"\" in it"
 
+_ = #"""#
+// CHECK: "\""
+
+_ = #""""#
+// CHECK: "\"\""
+
+_ = #"""""#
+// CHECK: "\"\"\""
+
+_ = #""""""#
+// CHECK: "\"\"\"\""
+
+_ = ##""" foo # "# "##
+// CHECK: "\"\" foo # \"# "
+
+_ = ###""" "# "## "###
+// CHECK: "\"\" \"# \"## "
+
+_ = ###"""##"###
+// CHECK: "\"\"##"
+
+_ = "interpolating \(#"""false delimiter"#)"
+// CHECK: "interpolating "
+// CHECK: "\"\"false delimiter"
+  
+_ = """
+  interpolating \(#"""false delimiters"""#)
+  """
+// CHECK: "interpolating "
+// CHECK: "\"\"false delimiters\"\""
+
 let foo = "Interpolation"
 _ = #"\b\b \#(foo)\#(foo) Kappa"#
 // CHECK: "\\b\\b "

test/Parse/raw_string_errors.swift

@@ -9,6 +9,11 @@ let _ = #"\##("invalid")"#
 // expected-error@-1{{too many '#' characters in delimited escape}}
 // expected-error@-2{{invalid escape sequence in literal}}
 
+let _ = ###"""invalid"######
+// expected-error@-1{{too many '#' characters in closing delimiter}}{{26-29=}}
+// expected-error@-2{{consecutive statements on a line must be separated by ';'}}
+// expected-error@-3{{expected expression}}
+
 let _ = ####"invalid"###
 // expected-error@-1{{unterminated string literal}}
 
@@ -17,8 +22,16 @@ let _ = ###"invalid"######
 // expected-error@-2{{consecutive statements on a line must be separated by ';'}}
 // expected-error@-3{{expected expression}}
 
-let _ = ##"""##
+let _ = ##"""aa
   foobar
-  ##"""##
+  aa"""##
 // expected-error@-3{{multi-line string literal content must begin on a new line}}{{14-14=\n}}
 // expected-error@-2{{multi-line string literal closing delimiter must begin on a new line}}{{5-5=\n}}
+
+let _ = #""" foo "bar" #baz
+  """#
+// expected-error@-2{{multi-line string literal content must begin on a new line}}{{13-13=\n}}
+
+let _ = ###""" "# "##
+  """###
+// expected-error@-2{{multi-line string literal content must begin on a new line}}{{15-15=\n}}