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1 module dmd.CommaExp;
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2
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114
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3 import dmd.common;
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0
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4 import dmd.Loc;
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5 import dmd.BinExp;
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6 import dmd.IRState;
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7 import dmd.Scope;
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8 import dmd.IntRange;
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179
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9 import dmd.DeclarationExp;
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10 import dmd.VarExp;
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11 import dmd.VarDeclaration;
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12 import dmd.Expression;
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163
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13 import dmd.GlobalExpressions;
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0
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14 import dmd.MATCH;
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15 import dmd.WANT;
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16 import dmd.TOK;
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17 import dmd.Type;
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18 import dmd.InterState;
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19
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20 import dmd.backend.elem;
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21 import dmd.backend.Util;
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22
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23 class CommaExp : BinExp
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24 {
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25 this(Loc loc, Expression e1, Expression e2)
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26 {
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178
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27 register();
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28
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29 super(loc, TOK.TOKcomma, CommaExp.sizeof, e1, e2);
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30 }
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31
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72
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32 override Expression semantic(Scope sc)
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33 {
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34 if (!type)
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35 {
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36 BinExp.semanticp(sc);
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37 type = e2.type;
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38 }
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39 return this;
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40 }
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41
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72
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42 override void checkEscape()
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43 {
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44 e2.checkEscape();
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45 }
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46
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135
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47 override void checkEscapeRef()
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48 {
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49 e2.checkEscapeRef();
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50 }
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51
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52 override IntRange getIntRange()
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53 {
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54 assert(false);
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55 }
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56
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57 version (DMDV2) {
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72
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58 override int isLvalue()
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59 {
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60 return e2.isLvalue();
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61 }
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62 }
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72
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63 override Expression toLvalue(Scope sc, Expression e)
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64 {
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65 e2 = e2.toLvalue(sc, null);
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66 return this;
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67 }
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68
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72
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69 override Expression modifiableLvalue(Scope sc, Expression e)
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70 {
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71 e2 = e2.modifiableLvalue(sc, e);
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72 return this;
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73 }
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74
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72
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75 override bool isBool(bool result)
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76 {
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77 return e2.isBool(result);
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78 }
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79
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80 override bool checkSideEffect(int flag)
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81 {
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82 if (flag == 2)
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83 return e1.checkSideEffect(2) || e2.checkSideEffect(2);
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84 else
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85 {
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86 // Don't check e1 until we cast(void) the a,b code generation
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87 return e2.checkSideEffect(flag);
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88 }
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89 }
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90
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72
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91 override MATCH implicitConvTo(Type t)
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92 {
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93 return e2.implicitConvTo(t);
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94 }
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95
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96 override Expression castTo(Scope sc, Type t)
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97 {
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56
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98 Expression e2c = e2.castTo(sc, t);
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99 Expression e;
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100
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101 if (e2c != e2)
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102 {
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103 e = new CommaExp(loc, e1, e2c);
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104 e.type = e2c.type;
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105 }
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106 else
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107 {
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108 e = this;
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109 e.type = e2.type;
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110 }
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111 return e;
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112 }
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113
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72
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114 override Expression optimize(int result)
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115 {
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116 Expression e;
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117
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118 //printf("CommaExp.optimize(result = %d) %s\n", result, toChars());
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179
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119 // Comma needs special treatment, because it may
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120 // contain compiler-generated declarations. We can interpret them, but
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121 // otherwise we must NOT attempt to constant-fold them.
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122 // In particular, if the comma returns a temporary variable, it needs
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123 // to be an lvalue (this is particularly important for struct constructors)
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124
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125 if (result & WANTinterpret)
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126 {
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127 // Interpreting comma needs special treatment, because it may
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128 // contain compiler-generated declarations.
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129 e = interpret(null);
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130 return (e is EXP_CANT_INTERPRET) ? this : e;
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131 }
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132 // Don't constant fold if it is a compiler-generated temporary.
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133 if (e1.op == TOKdeclaration)
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134 return this;
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135
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136 e1 = e1.optimize(result & WANTinterpret);
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137 e2 = e2.optimize(result);
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138 if (!e1 || e1.op == TOKint64 || e1.op == TOKfloat64 || !e1.checkSideEffect(2))
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139 {
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140 e = e2;
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141 if (e)
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142 e.type = type;
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143 }
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144 else
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145 e = this;
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146 //printf("-CommaExp.optimize(result = %d) %s\n", result, e.toChars());
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147 return e;
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148 }
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149
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72
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150 override Expression interpret(InterState istate)
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151 {
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163
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152 version (LOG) {
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153 printf("CommaExp.interpret() %.*s\n", toChars());
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154 }
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179
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155 // If the comma returns a temporary variable, it needs to be an lvalue
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156 // (this is particularly important for struct constructors)
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157 if (e1.op == TOKdeclaration && e2.op == TOKvar
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158 && (cast(DeclarationExp)e1).declaration == (cast(VarExp)e2).var)
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159 {
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160 VarExp ve = cast(VarExp)e2;
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161 VarDeclaration v = ve.var.isVarDeclaration();
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162 if (!v.init && !v.value)
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163 v.value = v.type.defaultInitLiteral(Loc(0));
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164 if (!v.value)
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165 v.value = v.init.toExpression();
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166 v.value = v.value.interpret(istate);
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167 return e2;
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168 }
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169
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163
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170 Expression e = e1.interpret(istate);
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171 if (e !is EXP_CANT_INTERPRET)
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172 e = e2.interpret(istate);
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173 return e;
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174 }
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175
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72
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176 override elem* toElem(IRState* irs)
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0
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177 {
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178 assert(e1 && e2);
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179 elem* eleft = e1.toElem(irs);
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180 elem* eright = e2.toElem(irs);
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181 elem* e = el_combine(eleft, eright);
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182 if (e)
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183 el_setLoc(e, loc);
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184 return e;
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185 }
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72
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186 }
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