adamc@16
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1 (* Copyright (c) 2008, Adam Chlipala
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2 * All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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6 *
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7 * - Redistributions of source code must retain the above copyright notice,
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8 * this list of conditions and the following disclaimer.
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9 * - Redistributions in binary form must reproduce the above copyright notice,
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10 * this list of conditions and the following disclaimer in the documentation
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11 * and/or other materials provided with the distribution.
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12 * - The names of contributors may not be used to endorse or promote products
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13 * derived from this software without specific prior written permission.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 * POSSIBILITY OF SUCH DAMAGE.
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26 *)
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27
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28 structure CoreEnv :> CORE_ENV = struct
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29
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30 open Core
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31
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32 structure U = CoreUtil
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33
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34 structure IM = IntBinaryMap
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35
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36
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37 (* AST utility functions *)
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38
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39 val liftKindInKind =
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40 U.Kind.mapB {kind = fn bound => fn k =>
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41 case k of
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42 KRel xn =>
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43 if xn < bound then
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44 k
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45 else
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46 KRel (xn + 1)
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47 | _ => k,
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48 bind = fn (bound, _) => bound + 1}
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49
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50 val liftKindInCon =
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51 U.Con.mapB {kind = fn bound => fn k =>
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52 case k of
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53 KRel xn =>
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54 if xn < bound then
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55 k
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56 else
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57 KRel (xn + 1)
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58 | _ => k,
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59 con = fn _ => fn c => c,
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60 bind = fn (bound, U.Con.RelK _) => bound + 1
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61 | (bound, _) => bound}
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62
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63 val liftKindInExp =
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64 U.Exp.mapB {kind = fn bound => fn k =>
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65 case k of
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66 KRel xn =>
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67 if xn < bound then
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68 k
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69 else
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70 KRel (xn + 1)
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71 | _ => k,
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72 con = fn _ => fn c => c,
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73 exp = fn _ => fn e => e,
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74 bind = fn (bound, U.Exp.RelK _) => bound + 1
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75 | (bound, _) => bound}
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76
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77 val liftConInCon =
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78 U.Con.mapB {kind = fn _ => fn k => k,
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79 con = fn bound => fn c =>
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80 case c of
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81 CRel xn =>
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82 if xn < bound then
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83 c
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84 else
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85 CRel (xn + 1)
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86 | _ => c,
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87 bind = fn (bound, U.Con.RelC _) => bound + 1
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88 | (bound, _) => bound}
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89
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90 val lift = liftConInCon 0
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91
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92 val subConInCon =
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93 U.Con.mapB {kind = fn _ => fn k => k,
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94 con = fn (xn, rep) => fn c =>
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95 case c of
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96 CRel xn' =>
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97 (case Int.compare (xn', xn) of
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98 EQUAL => #1 rep
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99 | GREATER => CRel (xn' - 1)
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100 | LESS => c)
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101 | _ => c,
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102 bind = fn ((xn, rep), U.Con.RelC _) => (xn+1, liftConInCon 0 rep)
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103 | (ctx, _) => ctx}
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104
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105
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106 val liftConInExp =
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107 U.Exp.mapB {kind = fn _ => fn k => k,
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108 con = fn bound => fn c =>
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109 case c of
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110 CRel xn =>
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111 if xn < bound then
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112 c
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113 else
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114 CRel (xn + 1)
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115 | _ => c,
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116 exp = fn _ => fn e => e,
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117 bind = fn (bound, U.Exp.RelC _) => bound + 1
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118 | (bound, _) => bound}
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119
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120 val subConInExp =
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121 U.Exp.mapB {kind = fn _ => fn k => k,
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122 con = fn (xn, rep) => fn c =>
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123 case c of
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124 CRel xn' =>
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125 (case Int.compare (xn', xn) of
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126 EQUAL => #1 rep
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127 | GREATER => CRel (xn' - 1)
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128 | LESS => c)
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129 | _ => c,
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130 exp = fn _ => fn e => e,
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131 bind = fn ((xn, rep), U.Exp.RelC _) => (xn+1, liftConInCon 0 rep)
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132 | (ctx, _) => ctx}
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133
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134 val liftExpInExp =
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135 U.Exp.mapB {kind = fn _ => fn k => k,
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136 con = fn _ => fn c => c,
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137 exp = fn bound => fn e =>
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138 case e of
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139 ERel xn =>
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140 if xn < bound then
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141 e
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142 else
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143 ERel (xn + 1)
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144 | _ => e,
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145 bind = fn (bound, U.Exp.RelE _) => bound + 1
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146 | (bound, _) => bound}
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147
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148 val subExpInExp =
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149 U.Exp.mapB {kind = fn _ => fn k => k,
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150 con = fn _ => fn c => c,
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151 exp = fn (xn, rep) => fn e =>
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152 case e of
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153 ERel xn' =>
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154 (case Int.compare (xn', xn) of
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155 EQUAL => #1 rep
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156 | GREATER=> ERel (xn' - 1)
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157 | LESS => e)
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158 | _ => e,
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159 bind = fn ((xn, rep), U.Exp.RelE _) => (xn+1, liftExpInExp 0 rep)
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160 | ((xn, rep), U.Exp.RelC _) => (xn, liftConInExp 0 rep)
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161 | (ctx, _) => ctx}
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162
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adamc@16
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163 (* Back to environments *)
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164
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165 exception UnboundRel of int
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166 exception UnboundNamed of int
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167
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168 type env = {
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169 relK : string list,
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170
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171 relC : (string * kind) list,
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172 namedC : (string * kind * con option) IM.map,
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173
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174 datatypes : (string * string list * (string * int * con option) list) IM.map,
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175 constructors : (string * string list * con option * int) IM.map,
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176
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177 relE : (string * con) list,
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178 namedE : (string * con * exp option * string) IM.map
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179 }
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180
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181 val empty = {
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182 relK = [],
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183
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184 relC = [],
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185 namedC = IM.empty,
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186
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187 datatypes = IM.empty,
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188 constructors = IM.empty,
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189
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190 relE = [],
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191 namedE = IM.empty
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192 }
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193
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194 fun pushKRel (env : env) x =
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195 {relK = x :: #relK env,
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196
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197 relC = map (fn (x, k) => (x, liftKindInKind 0 k)) (#relC env),
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198 namedC = #namedC env,
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199
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200 relE = map (fn (x, c) => (x, liftKindInCon 0 c)) (#relE env),
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201 namedE = #namedE env,
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202
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203 datatypes = #datatypes env,
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204 constructors = #constructors env
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205 }
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206
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207 fun lookupKRel (env : env) n =
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208 (List.nth (#relK env, n))
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209 handle Subscript => raise UnboundRel n
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210
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211 fun pushCRel (env : env) x k =
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212 {relK = #relK env,
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213
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214 relC = (x, k) :: #relC env,
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215 namedC = IM.map (fn (x, k, co) => (x, k, Option.map lift co)) (#namedC env),
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216
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217 datatypes = #datatypes env,
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218 constructors = #constructors env,
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219
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220 relE = map (fn (x, c) => (x, lift c)) (#relE env),
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221 namedE = IM.map (fn (x, c, eo, s) => (x, lift c, eo, s)) (#namedE env)}
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222
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223 fun lookupCRel (env : env) n =
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224 (List.nth (#relC env, n))
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225 handle Subscript => raise UnboundRel n
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226
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227 fun pushCNamed (env : env) x n k co =
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228 {relK = #relK env,
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229
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230 relC = #relC env,
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231 namedC = IM.insert (#namedC env, n, (x, k, co)),
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232
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233 datatypes = #datatypes env,
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234 constructors = #constructors env,
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235
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236 relE = #relE env,
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237 namedE = #namedE env}
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238
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239 fun lookupCNamed (env : env) n =
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240 case IM.find (#namedC env, n) of
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241 NONE => raise UnboundNamed n
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242 | SOME x => x
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243
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244 fun pushDatatype (env : env) x n xs xncs =
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245 {relK = #relK env,
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246
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247 relC = #relC env,
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248 namedC = #namedC env,
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249
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250 datatypes = IM.insert (#datatypes env, n, (x, xs, xncs)),
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251 constructors = foldl (fn ((x, n', to), constructors) =>
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252 IM.insert (constructors, n', (x, xs, to, n)))
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253 (#constructors env) xncs,
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254
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255 relE = #relE env,
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256 namedE = #namedE env}
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257
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258 fun lookupDatatype (env : env) n =
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259 case IM.find (#datatypes env, n) of
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260 NONE => raise UnboundNamed n
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261 | SOME x => x
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262
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263 fun lookupConstructor (env : env) n =
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264 case IM.find (#constructors env, n) of
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265 NONE => raise UnboundNamed n
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266 | SOME x => x
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267
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268 fun pushERel (env : env) x t =
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269 {relK = #relK env,
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270
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271 relC = #relC env,
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272 namedC = #namedC env,
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273
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274 datatypes = #datatypes env,
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275 constructors = #constructors env,
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276
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277 relE = (x, t) :: #relE env,
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278 namedE = #namedE env}
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279
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280 fun lookupERel (env : env) n =
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281 (List.nth (#relE env, n))
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282 handle Subscript => raise UnboundRel n
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283
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284 fun pushENamed (env : env) x n t eo s =
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285 {relK = #relK env,
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286
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287 relC = #relC env,
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288 namedC = #namedC env,
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289
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290 datatypes = #datatypes env,
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291 constructors = #constructors env,
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292
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293 relE = #relE env,
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294 namedE = IM.insert (#namedE env, n, (x, t, eo, s))}
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295
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296 fun lookupENamed (env : env) n =
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297 case IM.find (#namedE env, n) of
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298 NONE => raise UnboundNamed n
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299 | SOME x => x
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300
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301 fun declBinds env (d, loc) =
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302 case d of
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303 DCon (x, n, k, c) => pushCNamed env x n k (SOME c)
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304 | DDatatype dts =>
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305 foldl (fn ((x, n, xs, xncs), env) =>
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306 let
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307 val env = pushDatatype env x n xs xncs
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308 val env = pushCNamed env x n (KType, loc) NONE
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309 in
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310 foldl (fn ((x', n', NONE), env) => pushENamed env x' n' (CNamed n, loc) NONE ""
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311 | ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, (CNamed n, loc)), loc) NONE "")
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312 env xncs
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313 end) env dts
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314 | DVal (x, n, t, e, s) => pushENamed env x n t (SOME e) s
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315 | DValRec vis => foldl (fn ((x, n, t, e, s), env) => pushENamed env x n t NONE s) env vis
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316 | DExport _ => env
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317 | DTable (x, n, c, s, _, pc, _, cc) =>
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318 let
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319 val ct = (CFfi ("Basis", "sql_table"), loc)
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320 val ct = (CApp (ct, c), loc)
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321 val ct = (CApp (ct, (CConcat (pc, cc), loc)), loc)
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322 in
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323 pushENamed env x n ct NONE s
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324 end
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adamc@338
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325 | DSequence (x, n, s) =>
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326 let
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327 val t = (CFfi ("Basis", "sql_sequence"), loc)
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328 in
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329 pushENamed env x n t NONE s
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330 end
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331 | DView (x, n, s, _, c) =>
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332 let
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333 val ct = (CFfi ("Basis", "sql_view"), loc)
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334 val ct = (CApp (ct, c), loc)
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335 in
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336 pushENamed env x n ct NONE s
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337 end
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338 | DDatabase _ => env
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339 | DCookie (x, n, c, s) =>
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340 let
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341 val t = (CApp ((CFfi ("Basis", "http_cookie"), loc), c), loc)
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342 in
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343 pushENamed env x n t NONE s
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344 end
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345 | DStyle (x, n, s) =>
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346 let
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347 val t = (CFfi ("Basis", "css_class"), loc)
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348 in
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349 pushENamed env x n t NONE s
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350 end
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adamc@1075
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351 | DTask _ => env
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352 | DPolicy _ => env
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adam@1294
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353 | DOnError _ => env
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adamc@16
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354
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adamc@193
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355 fun patBinds env (p, loc) =
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adamc@193
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356 case p of
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adamc@193
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357 PWild => env
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adamc@193
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358 | PVar (x, t) => pushERel env x t
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adamc@193
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359 | PPrim _ => env
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adamc@193
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360 | PCon (_, _, _, NONE) => env
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adamc@193
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361 | PCon (_, _, _, SOME p) => patBinds env p
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adamc@193
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362 | PRecord xps => foldl (fn ((_, p, _), env) => patBinds env p) env xps
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adamc@193
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363
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adamc@642
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364 fun patBindsN (p, loc) =
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adamc@642
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365 case p of
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adamc@642
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366 PWild => 0
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adamc@642
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367 | PVar _ => 1
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adamc@642
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368 | PPrim _ => 0
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adamc@642
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369 | PCon (_, _, _, NONE) => 0
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adamc@642
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370 | PCon (_, _, _, SOME p) => patBindsN p
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adamc@642
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371 | PRecord xps => foldl (fn ((_, p, _), count) => count + patBindsN p) 0 xps
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adamc@642
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372
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adamc@1080
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373 fun patBindsL (p, loc) =
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adamc@1080
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374 case p of
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adamc@1080
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375 PWild => []
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adamc@1080
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376 | PVar (x, t) => [(x, t)]
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adamc@1080
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377 | PPrim _ => []
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adamc@1080
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378 | PCon (_, _, _, NONE) => []
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adamc@1080
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379 | PCon (_, _, _, SOME p) => patBindsL p
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adamc@1080
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380 | PRecord xps => rev (ListUtil.mapConcat (rev o patBindsL o #2) xps)
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adamc@1080
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381
|
adamc@16
|
382 end
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