adding comments and some newlines (#294)

* adding comments and some newlines

* Update executable_semantics/interpreter/typecheck.cpp

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* Update executable_semantics/interpreter/typecheck.cpp

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* Update executable_semantics/interpreter/typecheck.cpp

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* Update executable_semantics/interpreter/typecheck.cpp

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* Update executable_semantics/interpreter/typecheck.cpp

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* changed comment style

* Update executable_semantics/interpreter/typecheck.cpp

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* Update executable_semantics/interpreter/typecheck.cpp

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

executable_semantics/ast/declaration.h

@@ -24,12 +24,15 @@ struct Declaration {
   DeclarationKind tag;
   union {
     struct FunctionDefinition* fun_def;
+
     struct StructDefinition* struct_def;
+
     struct {
       int line_num;
       std::string* name;
       std::list<std::pair<std::string, Expression*>>* alternatives;
     } choice_def;
+
   } u;
 };
 

executable_semantics/ast/expression.h

@@ -26,6 +26,7 @@ enum class ExpressionKind {
   TypeT,
   Variable,
 };
+
 enum class Operator {
   Add,
   And,
@@ -43,35 +44,44 @@ struct Expression {
     struct {
       std::string* name;
     } variable;
+
     struct {
       Expression* aggregate;
       std::string* field;
     } get_field;
+
     struct {
       Expression* aggregate;
       Expression* offset;
     } index;
+
     struct {
       std::string* name;
       Expression* type;
     } pattern_variable;
+
     int integer;
     bool boolean;
+
     struct {
       std::vector<std::pair<std::string, Expression*>>* fields;
     } tuple;
+
     struct {
       Operator op;
       std::vector<Expression*>* arguments;
     } primitive_op;
+
     struct {
       Expression* function;
       Expression* argument;
     } call;
+
     struct {
       Expression* parameter;
       Expression* return_type;
     } function_type;
+
   } u;
 };
 

executable_semantics/ast/statement.h

@@ -28,37 +28,47 @@ enum class StatementKind {
 struct Statement {
   int line_num;
   StatementKind tag;
+
   union {
     Expression* exp;
+
     struct {
       Expression* lhs;
       Expression* rhs;
     } assign;
+
     struct {
       Expression* pat;
       Expression* init;
     } variable_definition;
+
     struct {
       Expression* cond;
       Statement* then_stmt;
       Statement* else_stmt;
     } if_stmt;
+
     Expression* return_stmt;
+
     struct {
       Statement* stmt;
       Statement* next;
     } sequence;
+
     struct {
       Statement* stmt;
     } block;
+
     struct {
       Expression* cond;
       Statement* body;
     } while_stmt;
+
     struct {
       Expression* exp;
       std::list<std::pair<Expression*, Statement*>>* clauses;
     } match_stmt;
+
   } u;
 };