Add test cases for multi expressions in ExpressionSegment

Author: kitasuke

test/Syntax/Outputs/round_trip_parse_gen.swift.withkinds

@@ -434,11 +434,12 @@ extension <SimpleTypeIdentifier>ext </SimpleTypeIdentifier><GenericWhereClause>w
 extension <MemberTypeIdentifier><MemberTypeIdentifier><SimpleTypeIdentifier>ext</SimpleTypeIdentifier>.a</MemberTypeIdentifier>.b </MemberTypeIdentifier><MemberDeclBlock>{}</MemberDeclBlock></ExtensionDecl><FunctionDecl>
 
 func foo<FunctionSignature><ParameterClause>() </ParameterClause></FunctionSignature><CodeBlock>{<VariableDecl>
-  var <PatternBinding><IdentifierPattern>a </IdentifierPattern><InitializerClause>= <StringInterpolationExpr>"<StringSegment>abc </StringSegment><ExpressionSegment>\(<FunctionCallArgument><FunctionCallExpr><IdentifierExpr>foo</IdentifierExpr>()</FunctionCallExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment> def </StringSegment><ExpressionSegment>\(<FunctionCallArgument><SequenceExpr><IdentifierExpr>a </IdentifierExpr><BinaryOperatorExpr>+ </BinaryOperatorExpr><IdentifierExpr>b </IdentifierExpr><BinaryOperatorExpr>+ </BinaryOperatorExpr><StringInterpolationExpr>"<StringSegment>a </StringSegment><ExpressionSegment>\(<FunctionCallArgument><IntegerLiteralExpr>3</IntegerLiteralExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment></StringSegment>"</StringInterpolationExpr></SequenceExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment> gh</StringSegment>"</StringInterpolationExpr></InitializerClause></PatternBinding></VariableDecl><VariableDecl>
+  var <PatternBinding><IdentifierPattern>a </IdentifierPattern><InitializerClause>= <StringInterpolationExpr>"<StringSegment>abc </StringSegment><ExpressionSegment>\(<FunctionCallArgument><FunctionCallExpr><IdentifierExpr>foo</IdentifierExpr>()</FunctionCallExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment> def </StringSegment><ExpressionSegment>\(<FunctionCallArgument><SequenceExpr><IdentifierExpr>a </IdentifierExpr><BinaryOperatorExpr>+ </BinaryOperatorExpr><IdentifierExpr>b </IdentifierExpr><BinaryOperatorExpr>+ </BinaryOperatorExpr><StringInterpolationExpr>"<StringSegment>a </StringSegment><ExpressionSegment>\(<FunctionCallArgument><IntegerLiteralExpr>3</IntegerLiteralExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment></StringSegment>"</StringInterpolationExpr></SequenceExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment> gh </StringSegment><ExpressionSegment>\(<FunctionCallArgument><IdentifierExpr>bar</IdentifierExpr>, </FunctionCallArgument><FunctionCallArgument>default: <IntegerLiteralExpr>1</IntegerLiteralExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment></StringSegment>"</StringInterpolationExpr></InitializerClause></PatternBinding></VariableDecl><VariableDecl>
   var <PatternBinding><IdentifierPattern>a </IdentifierPattern><InitializerClause>= <StringInterpolationExpr>"""<StringSegment>
   abc </StringSegment><ExpressionSegment>\( <FunctionCallArgument><SequenceExpr><FunctionCallExpr><IdentifierExpr>foo</IdentifierExpr>() </FunctionCallExpr><BinaryOperatorExpr>+ </BinaryOperatorExpr><FunctionCallExpr><IdentifierExpr>bar</IdentifierExpr>() </FunctionCallExpr></SequenceExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment>
   de </StringSegment><ExpressionSegment>\(<FunctionCallArgument><SequenceExpr><IntegerLiteralExpr>3 </IntegerLiteralExpr><BinaryOperatorExpr>+ </BinaryOperatorExpr><IntegerLiteralExpr>3 </IntegerLiteralExpr><BinaryOperatorExpr>+ </BinaryOperatorExpr><StringInterpolationExpr>"<StringSegment>abc </StringSegment><ExpressionSegment>\(<FunctionCallArgument><FunctionCallExpr><IdentifierExpr>foo</IdentifierExpr>()</FunctionCallExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment> def</StringSegment>"</StringInterpolationExpr></SequenceExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment>
   fg
+  </StringSegment><ExpressionSegment>\(<FunctionCallArgument><IdentifierExpr>bar</IdentifierExpr>, </FunctionCallArgument><FunctionCallArgument>default: <IntegerLiteralExpr>1</IntegerLiteralExpr></FunctionCallArgument>)</ExpressionSegment><StringSegment>
   </StringSegment>"""</StringInterpolationExpr></InitializerClause></PatternBinding></VariableDecl>
 }</CodeBlock></FunctionDecl><FunctionDecl>
 

test/Syntax/round_trip_parse_gen.swift

@@ -434,11 +434,12 @@ extension ext where A == Int, B: Numeric {}
 extension ext.a.b {}
 
 func foo() {
-  var a = "abc \(foo()) def \(a + b + "a \(3)") gh"
+  var a = "abc \(foo()) def \(a + b + "a \(3)") gh \(bar, default: 1)"
   var a = """
   abc \( foo() + bar() )
   de \(3 + 3 + "abc \(foo()) def")
   fg
+  \(bar, default: 1)
   """
 }