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Swift: fix CFG inconsistency on TapExpr 
1 parent b26b0a6 commit 7b76aa3

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12 files changed

+15
-203
lines changed

12 files changed

+15
-203
lines changed

‎swift/ql/lib/codeql/swift/controlflow/internal/ControlFlowGraphImpl.qll

Lines changed: 6 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -111,31 +111,21 @@ module Stmts {
111111

112112
override predicate propagatesAbnormal(ControlFlowElement node) { none() }
113113

114-
private predicate isBodyOfTapExpr() { any(TapExpr tap).getBody() = ast }
115-
116-
// Note: If the brace statement is the body of a `TapExpr`, the first element is the variable
117-
// declaration (see https://github.com/apple/swift/blob/main/include/swift/AST/Expr.h#L848)
118-
// that's initialized by the `TapExpr`. In `TapExprTree` we've already visited this declaration,
119-
// along with its initializer. So we skip the first element here.
120-
private AstNode getFirstElement() {
121-
if this.isBodyOfTapExpr() then result = ast.getElement(1) else result = ast.getFirstElement()
122-
}
123-
124114
override predicate first(ControlFlowElement first) {
125115
this.firstInner(first)
126116
or
127-
not exists(this.getFirstElement()) and first.asAstNode() = ast
117+
not exists(ast.getFirstElement()) and first.asAstNode() = ast
128118
}
129119

130120
override predicate last(ControlFlowElement last, Completion c) {
131121
this.lastInner(last, c)
132122
or
133-
not exists(this.getFirstElement()) and
123+
not exists(ast.getFirstElement()) and
134124
last.asAstNode() = ast and
135125
c instanceof SimpleCompletion
136126
}
137127

138-
predicate firstInner(ControlFlowElement first) { astFirst(this.getFirstElement(), first) }
128+
predicate firstInner(ControlFlowElement first) { astFirst(ast.getFirstElement(), first) }
139129

140130
/** Gets the body of the i'th `defer` statement. */
141131
private BraceStmt getDeferStmtBody(int i) {
@@ -1406,20 +1396,12 @@ module Exprs {
14061396
override TapExpr ast;
14071397

14081398
final override ControlFlowElement getChildElement(int i) {
1409-
// We first visit the local variable declaration.
1399+
// We first visit the expression that gives the local variable its initial value.
14101400
i = 0 and
1411-
result.asAstNode() = ast.getVar()
1412-
or
1413-
// Then we visit the expression that gives the local variable its initial value.
1414-
i = 1 and
14151401
result.asAstNode() = ast.getSubExpr().getFullyConverted()
14161402
or
1417-
// And finally, we visit the body that potentially mutates the local variable.
1418-
// Note that the CFG for the body will skip the first element in the
1419-
// body because it's guaranteed to be the variable declaration
1420-
// that we've already visited at i = 0. See the explanation
1421-
// in `BraceStmtTree` for why this is necessary.
1422-
i = 2 and
1403+
// And then we visit the body that potentially mutates the local variable.
1404+
i = 1 and
14231405
result.asAstNode() = ast.getBody()
14241406
}
14251407
}

‎swift/ql/test/library-tests/ast/CONSISTENCY/CfgConsistency.expected

Lines changed: 0 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -5,10 +5,6 @@ multipleSuccessors
55
| cfg.swift:144:10:144:10 | =~ ... | no-match | cfg.swift:146:5:147:14 | case ... |
66
| cfg.swift:515:6:515:28 | #available | false | cfg.swift:515:42:515:46 | iOS 12 |
77
| cfg.swift:515:6:515:28 | #available | false | cfg.swift:519:10:519:10 | x |
8-
| file://:0:0:0:0 | $interpolation | successor | cfg.swift:40:11:40:11 | OpaqueValueExpr |
9-
| file://:0:0:0:0 | $interpolation | successor | cfg.swift:40:12:40:12 | .appendLiteral(_:) |
10-
| file://:0:0:0:0 | $interpolation | successor | cfg.swift:263:10:263:10 | OpaqueValueExpr |
11-
| file://:0:0:0:0 | $interpolation | successor | cfg.swift:263:11:263:11 | .appendLiteral(_:) |
128
deadEnd
139
| cfg.swift:33:49:33:60 | call to isZero(x:) |
1410
| cfg.swift:144:18:144:34 | ... .&&(_:_:) ... |

‎swift/ql/test/library-tests/controlflow/graph/CONSISTENCY/CfgConsistency.expected

Lines changed: 0 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -5,10 +5,6 @@ multipleSuccessors
55
| cfg.swift:144:10:144:10 | =~ ... | no-match | cfg.swift:146:5:147:14 | case ... |
66
| cfg.swift:515:6:515:28 | #available | false | cfg.swift:515:42:515:46 | iOS 12 |
77
| cfg.swift:515:6:515:28 | #available | false | cfg.swift:519:10:519:10 | x |
8-
| file://:0:0:0:0 | $interpolation | successor | cfg.swift:40:11:40:11 | OpaqueValueExpr |
9-
| file://:0:0:0:0 | $interpolation | successor | cfg.swift:40:12:40:12 | .appendLiteral(_:) |
10-
| file://:0:0:0:0 | $interpolation | successor | cfg.swift:263:10:263:10 | OpaqueValueExpr |
11-
| file://:0:0:0:0 | $interpolation | successor | cfg.swift:263:11:263:11 | .appendLiteral(_:) |
128
deadEnd
139
| cfg.swift:33:49:33:60 | call to isZero(x:) |
1410
| cfg.swift:144:18:144:34 | ... .&&(_:_:) ... |

‎swift/ql/test/library-tests/controlflow/graph/Cfg.expected

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -349,6 +349,7 @@ cfg.swift:
349349
#-----| match -> print(_:separator:terminator:)
350350

351351
# 40| print(_:separator:terminator:)
352+
#-----| -> OpaqueValueExpr
352353

353354
# 40| call to print(_:separator:terminator:)
354355
#-----| -> 0
@@ -366,7 +367,6 @@ cfg.swift:
366367
#-----| -> [...]
367368

368369
# 40| OpaqueValueExpr
369-
#-----| -> .appendLiteral(_:)
370370

371371
# 40| TapExpr
372372
#-----| -> "..."
@@ -2777,6 +2777,7 @@ cfg.swift:
27772777
#-----| -> y
27782778

27792779
# 262| y
2780+
#-----| -> OpaqueValueExpr
27802781

27812782
# 263| return ...
27822783
#-----| return -> exit interpolatedString(x:y:) (normal)
@@ -2788,7 +2789,6 @@ cfg.swift:
27882789
#-----| -> return ...
27892790

27902791
# 263| OpaqueValueExpr
2791-
#-----| -> .appendLiteral(_:)
27922792

27932793
# 263| TapExpr
27942794
#-----| -> "..."

‎swift/ql/test/library-tests/dataflow/taint/core/CONSISTENCY/CfgConsistency.expected

Lines changed: 0 additions & 15 deletions
This file was deleted.

‎swift/ql/test/library-tests/dataflow/taint/core/LocalTaint.expected

Lines changed: 7 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -150,15 +150,14 @@
150150
| stringinterpolation.swift:13:3:13:3 | self | stringinterpolation.swift:13:3:13:3 | &... |
151151
| stringinterpolation.swift:13:23:13:23 | "..." | stringinterpolation.swift:13:3:13:3 | [post] &... |
152152
| stringinterpolation.swift:13:23:13:23 | "..." | stringinterpolation.swift:13:23:13:23 | [post] "..." |
153-
| stringinterpolation.swift:13:23:13:23 | SSA def($interpolation) | stringinterpolation.swift:13:24:13:24 | SSA phi($interpolation) |
153+
| stringinterpolation.swift:13:23:13:23 | SSA def($interpolation) | stringinterpolation.swift:13:24:13:24 | $interpolation |
154154
| stringinterpolation.swift:13:23:13:23 | TapExpr | stringinterpolation.swift:13:23:13:23 | "..." |
155155
| stringinterpolation.swift:13:23:13:23 | first is: | stringinterpolation.swift:13:23:13:23 | [post] first is: |
156156
| stringinterpolation.swift:13:23:13:23 | first is: | stringinterpolation.swift:13:24:13:24 | [post] &... |
157157
| stringinterpolation.swift:13:24:13:24 | $interpolation | stringinterpolation.swift:13:24:13:24 | &... |
158158
| stringinterpolation.swift:13:24:13:24 | &... | stringinterpolation.swift:13:23:13:23 | [post] first is: |
159159
| stringinterpolation.swift:13:24:13:24 | &... | stringinterpolation.swift:13:24:13:24 | [post] &... |
160160
| stringinterpolation.swift:13:24:13:24 | &... | stringinterpolation.swift:13:35:13:35 | $interpolation |
161-
| stringinterpolation.swift:13:24:13:24 | SSA phi($interpolation) | stringinterpolation.swift:13:24:13:24 | $interpolation |
162161
| stringinterpolation.swift:13:24:13:24 | [post] &... | stringinterpolation.swift:13:35:13:35 | $interpolation |
163162
| stringinterpolation.swift:13:35:13:35 | $interpolation | stringinterpolation.swift:13:35:13:35 | &... |
164163
| stringinterpolation.swift:13:35:13:35 | &... | stringinterpolation.swift:13:35:13:35 | [post] &... |
@@ -179,15 +178,14 @@
179178
| stringinterpolation.swift:19:2:19:2 | p1 | stringinterpolation.swift:20:2:20:2 | p1 |
180179
| stringinterpolation.swift:20:2:20:2 | [post] p1 | stringinterpolation.swift:22:21:22:21 | p1 |
181180
| stringinterpolation.swift:20:2:20:2 | p1 | stringinterpolation.swift:22:21:22:21 | p1 |
182-
| stringinterpolation.swift:22:12:22:12 | SSA def($interpolation) | stringinterpolation.swift:22:13:22:13 | SSA phi($interpolation) |
181+
| stringinterpolation.swift:22:12:22:12 | SSA def($interpolation) | stringinterpolation.swift:22:13:22:13 | $interpolation |
183182
| stringinterpolation.swift:22:12:22:12 | TapExpr | stringinterpolation.swift:22:12:22:12 | "..." |
184183
| stringinterpolation.swift:22:12:22:12 | pair: | stringinterpolation.swift:22:12:22:12 | [post] pair: |
185184
| stringinterpolation.swift:22:12:22:12 | pair: | stringinterpolation.swift:22:13:22:13 | [post] &... |
186185
| stringinterpolation.swift:22:13:22:13 | $interpolation | stringinterpolation.swift:22:13:22:13 | &... |
187186
| stringinterpolation.swift:22:13:22:13 | &... | stringinterpolation.swift:22:12:22:12 | [post] pair: |
188187
| stringinterpolation.swift:22:13:22:13 | &... | stringinterpolation.swift:22:13:22:13 | [post] &... |
189188
| stringinterpolation.swift:22:13:22:13 | &... | stringinterpolation.swift:22:20:22:20 | $interpolation |
190-
| stringinterpolation.swift:22:13:22:13 | SSA phi($interpolation) | stringinterpolation.swift:22:13:22:13 | $interpolation |
191189
| stringinterpolation.swift:22:13:22:13 | [post] &... | stringinterpolation.swift:22:20:22:20 | $interpolation |
192190
| stringinterpolation.swift:22:20:22:20 | $interpolation | stringinterpolation.swift:22:20:22:20 | &... |
193191
| stringinterpolation.swift:22:20:22:20 | &... | stringinterpolation.swift:22:20:22:20 | [post] &... |
@@ -203,15 +201,14 @@
203201
| stringinterpolation.swift:22:30:22:30 | &... | stringinterpolation.swift:22:30:22:30 | [post] |
204202
| stringinterpolation.swift:22:30:22:30 | &... | stringinterpolation.swift:22:30:22:30 | [post] &... |
205203
| stringinterpolation.swift:22:30:22:30 | [post] &... | stringinterpolation.swift:22:12:22:12 | TapExpr |
206-
| stringinterpolation.swift:23:12:23:12 | SSA def($interpolation) | stringinterpolation.swift:23:13:23:13 | SSA phi($interpolation) |
204+
| stringinterpolation.swift:23:12:23:12 | SSA def($interpolation) | stringinterpolation.swift:23:13:23:13 | $interpolation |
207205
| stringinterpolation.swift:23:12:23:12 | TapExpr | stringinterpolation.swift:23:12:23:12 | "..." |
208206
| stringinterpolation.swift:23:12:23:12 | pair: | stringinterpolation.swift:23:12:23:12 | [post] pair: |
209207
| stringinterpolation.swift:23:12:23:12 | pair: | stringinterpolation.swift:23:13:23:13 | [post] &... |
210208
| stringinterpolation.swift:23:13:23:13 | $interpolation | stringinterpolation.swift:23:13:23:13 | &... |
211209
| stringinterpolation.swift:23:13:23:13 | &... | stringinterpolation.swift:23:12:23:12 | [post] pair: |
212210
| stringinterpolation.swift:23:13:23:13 | &... | stringinterpolation.swift:23:13:23:13 | [post] &... |
213211
| stringinterpolation.swift:23:13:23:13 | &... | stringinterpolation.swift:23:20:23:20 | $interpolation |
214-
| stringinterpolation.swift:23:13:23:13 | SSA phi($interpolation) | stringinterpolation.swift:23:13:23:13 | $interpolation |
215212
| stringinterpolation.swift:23:13:23:13 | [post] &... | stringinterpolation.swift:23:20:23:20 | $interpolation |
216213
| stringinterpolation.swift:23:20:23:20 | $interpolation | stringinterpolation.swift:23:20:23:20 | &... |
217214
| stringinterpolation.swift:23:20:23:20 | &... | stringinterpolation.swift:23:20:23:20 | [post] &... |
@@ -227,15 +224,14 @@
227224
| stringinterpolation.swift:23:31:23:31 | &... | stringinterpolation.swift:23:31:23:31 | [post] |
228225
| stringinterpolation.swift:23:31:23:31 | &... | stringinterpolation.swift:23:31:23:31 | [post] &... |
229226
| stringinterpolation.swift:23:31:23:31 | [post] &... | stringinterpolation.swift:23:12:23:12 | TapExpr |
230-
| stringinterpolation.swift:24:12:24:12 | SSA def($interpolation) | stringinterpolation.swift:24:13:24:13 | SSA phi($interpolation) |
227+
| stringinterpolation.swift:24:12:24:12 | SSA def($interpolation) | stringinterpolation.swift:24:13:24:13 | $interpolation |
231228
| stringinterpolation.swift:24:12:24:12 | TapExpr | stringinterpolation.swift:24:12:24:12 | "..." |
232229
| stringinterpolation.swift:24:12:24:12 | pair: | stringinterpolation.swift:24:12:24:12 | [post] pair: |
233230
| stringinterpolation.swift:24:12:24:12 | pair: | stringinterpolation.swift:24:13:24:13 | [post] &... |
234231
| stringinterpolation.swift:24:13:24:13 | $interpolation | stringinterpolation.swift:24:13:24:13 | &... |
235232
| stringinterpolation.swift:24:13:24:13 | &... | stringinterpolation.swift:24:12:24:12 | [post] pair: |
236233
| stringinterpolation.swift:24:13:24:13 | &... | stringinterpolation.swift:24:13:24:13 | [post] &... |
237234
| stringinterpolation.swift:24:13:24:13 | &... | stringinterpolation.swift:24:20:24:20 | $interpolation |
238-
| stringinterpolation.swift:24:13:24:13 | SSA phi($interpolation) | stringinterpolation.swift:24:13:24:13 | $interpolation |
239235
| stringinterpolation.swift:24:13:24:13 | [post] &... | stringinterpolation.swift:24:20:24:20 | $interpolation |
240236
| stringinterpolation.swift:24:20:24:20 | $interpolation | stringinterpolation.swift:24:20:24:20 | &... |
241237
| stringinterpolation.swift:24:20:24:20 | &... | stringinterpolation.swift:24:20:24:20 | [post] &... |
@@ -258,15 +254,14 @@
258254
| stringinterpolation.swift:27:2:27:2 | p2 | stringinterpolation.swift:28:2:28:2 | p2 |
259255
| stringinterpolation.swift:28:2:28:2 | [post] p2 | stringinterpolation.swift:30:21:30:21 | p2 |
260256
| stringinterpolation.swift:28:2:28:2 | p2 | stringinterpolation.swift:30:21:30:21 | p2 |
261-
| stringinterpolation.swift:30:12:30:12 | SSA def($interpolation) | stringinterpolation.swift:30:13:30:13 | SSA phi($interpolation) |
257+
| stringinterpolation.swift:30:12:30:12 | SSA def($interpolation) | stringinterpolation.swift:30:13:30:13 | $interpolation |
262258
| stringinterpolation.swift:30:12:30:12 | TapExpr | stringinterpolation.swift:30:12:30:12 | "..." |
263259
| stringinterpolation.swift:30:12:30:12 | pair: | stringinterpolation.swift:30:12:30:12 | [post] pair: |
264260
| stringinterpolation.swift:30:12:30:12 | pair: | stringinterpolation.swift:30:13:30:13 | [post] &... |
265261
| stringinterpolation.swift:30:13:30:13 | $interpolation | stringinterpolation.swift:30:13:30:13 | &... |
266262
| stringinterpolation.swift:30:13:30:13 | &... | stringinterpolation.swift:30:12:30:12 | [post] pair: |
267263
| stringinterpolation.swift:30:13:30:13 | &... | stringinterpolation.swift:30:13:30:13 | [post] &... |
268264
| stringinterpolation.swift:30:13:30:13 | &... | stringinterpolation.swift:30:20:30:20 | $interpolation |
269-
| stringinterpolation.swift:30:13:30:13 | SSA phi($interpolation) | stringinterpolation.swift:30:13:30:13 | $interpolation |
270265
| stringinterpolation.swift:30:13:30:13 | [post] &... | stringinterpolation.swift:30:20:30:20 | $interpolation |
271266
| stringinterpolation.swift:30:20:30:20 | $interpolation | stringinterpolation.swift:30:20:30:20 | &... |
272267
| stringinterpolation.swift:30:20:30:20 | &... | stringinterpolation.swift:30:20:30:20 | [post] &... |
@@ -282,15 +277,14 @@
282277
| stringinterpolation.swift:30:30:30:30 | &... | stringinterpolation.swift:30:30:30:30 | [post] |
283278
| stringinterpolation.swift:30:30:30:30 | &... | stringinterpolation.swift:30:30:30:30 | [post] &... |
284279
| stringinterpolation.swift:30:30:30:30 | [post] &... | stringinterpolation.swift:30:12:30:12 | TapExpr |
285-
| stringinterpolation.swift:31:12:31:12 | SSA def($interpolation) | stringinterpolation.swift:31:13:31:13 | SSA phi($interpolation) |
280+
| stringinterpolation.swift:31:12:31:12 | SSA def($interpolation) | stringinterpolation.swift:31:13:31:13 | $interpolation |
286281
| stringinterpolation.swift:31:12:31:12 | TapExpr | stringinterpolation.swift:31:12:31:12 | "..." |
287282
| stringinterpolation.swift:31:12:31:12 | pair: | stringinterpolation.swift:31:12:31:12 | [post] pair: |
288283
| stringinterpolation.swift:31:12:31:12 | pair: | stringinterpolation.swift:31:13:31:13 | [post] &... |
289284
| stringinterpolation.swift:31:13:31:13 | $interpolation | stringinterpolation.swift:31:13:31:13 | &... |
290285
| stringinterpolation.swift:31:13:31:13 | &... | stringinterpolation.swift:31:12:31:12 | [post] pair: |
291286
| stringinterpolation.swift:31:13:31:13 | &... | stringinterpolation.swift:31:13:31:13 | [post] &... |
292287
| stringinterpolation.swift:31:13:31:13 | &... | stringinterpolation.swift:31:20:31:20 | $interpolation |
293-
| stringinterpolation.swift:31:13:31:13 | SSA phi($interpolation) | stringinterpolation.swift:31:13:31:13 | $interpolation |
294288
| stringinterpolation.swift:31:13:31:13 | [post] &... | stringinterpolation.swift:31:20:31:20 | $interpolation |
295289
| stringinterpolation.swift:31:20:31:20 | $interpolation | stringinterpolation.swift:31:20:31:20 | &... |
296290
| stringinterpolation.swift:31:20:31:20 | &... | stringinterpolation.swift:31:20:31:20 | [post] &... |
@@ -306,15 +300,14 @@
306300
| stringinterpolation.swift:31:31:31:31 | &... | stringinterpolation.swift:31:31:31:31 | [post] |
307301
| stringinterpolation.swift:31:31:31:31 | &... | stringinterpolation.swift:31:31:31:31 | [post] &... |
308302
| stringinterpolation.swift:31:31:31:31 | [post] &... | stringinterpolation.swift:31:12:31:12 | TapExpr |
309-
| stringinterpolation.swift:32:12:32:12 | SSA def($interpolation) | stringinterpolation.swift:32:13:32:13 | SSA phi($interpolation) |
303+
| stringinterpolation.swift:32:12:32:12 | SSA def($interpolation) | stringinterpolation.swift:32:13:32:13 | $interpolation |
310304
| stringinterpolation.swift:32:12:32:12 | TapExpr | stringinterpolation.swift:32:12:32:12 | "..." |
311305
| stringinterpolation.swift:32:12:32:12 | pair: | stringinterpolation.swift:32:12:32:12 | [post] pair: |
312306
| stringinterpolation.swift:32:12:32:12 | pair: | stringinterpolation.swift:32:13:32:13 | [post] &... |
313307
| stringinterpolation.swift:32:13:32:13 | $interpolation | stringinterpolation.swift:32:13:32:13 | &... |
314308
| stringinterpolation.swift:32:13:32:13 | &... | stringinterpolation.swift:32:12:32:12 | [post] pair: |
315309
| stringinterpolation.swift:32:13:32:13 | &... | stringinterpolation.swift:32:13:32:13 | [post] &... |
316310
| stringinterpolation.swift:32:13:32:13 | &... | stringinterpolation.swift:32:20:32:20 | $interpolation |
317-
| stringinterpolation.swift:32:13:32:13 | SSA phi($interpolation) | stringinterpolation.swift:32:13:32:13 | $interpolation |
318311
| stringinterpolation.swift:32:13:32:13 | [post] &... | stringinterpolation.swift:32:20:32:20 | $interpolation |
319312
| stringinterpolation.swift:32:20:32:20 | $interpolation | stringinterpolation.swift:32:20:32:20 | &... |
320313
| stringinterpolation.swift:32:20:32:20 | &... | stringinterpolation.swift:32:20:32:20 | [post] &... |

‎swift/ql/test/library-tests/dataflow/taint/libraries/CONSISTENCY/CfgConsistency.expected

Lines changed: 0 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -1,18 +1,3 @@
1-
multipleSuccessors
2-
| file://:0:0:0:0 | $interpolation | successor | string.swift:139:13:139:13 | OpaqueValueExpr |
3-
| file://:0:0:0:0 | $interpolation | successor | string.swift:139:14:139:14 | .appendLiteral(_:) |
4-
| file://:0:0:0:0 | $interpolation | successor | string.swift:141:13:141:13 | OpaqueValueExpr |
5-
| file://:0:0:0:0 | $interpolation | successor | string.swift:141:14:141:14 | .appendLiteral(_:) |
6-
| file://:0:0:0:0 | $interpolation | successor | string.swift:143:13:143:13 | OpaqueValueExpr |
7-
| file://:0:0:0:0 | $interpolation | successor | string.swift:143:14:143:14 | .appendLiteral(_:) |
8-
| file://:0:0:0:0 | $interpolation | successor | string.swift:147:13:147:13 | OpaqueValueExpr |
9-
| file://:0:0:0:0 | $interpolation | successor | string.swift:147:14:147:14 | .appendLiteral(_:) |
10-
| file://:0:0:0:0 | $interpolation | successor | string.swift:149:13:149:13 | OpaqueValueExpr |
11-
| file://:0:0:0:0 | $interpolation | successor | string.swift:149:14:149:14 | .appendLiteral(_:) |
12-
| file://:0:0:0:0 | $interpolation | successor | string.swift:151:13:151:13 | OpaqueValueExpr |
13-
| file://:0:0:0:0 | $interpolation | successor | string.swift:151:14:151:14 | .appendLiteral(_:) |
14-
| file://:0:0:0:0 | $interpolation | successor | string.swift:154:13:154:13 | OpaqueValueExpr |
15-
| file://:0:0:0:0 | $interpolation | successor | string.swift:154:14:154:14 | .appendLiteral(_:) |
161
deadEnd
172
| file://:0:0:0:0 | ... = ... |
183
| file://:0:0:0:0 | ... = ... |

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