Fix init error in test #8109
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Fix init error in test #8109
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nicolasstucki
approved these changes
Jan 28, 2020
| initLabels(0, 0, new mutable.ArrayBuffer[String], new mutable.ArrayBuffer[Array[String]]) | ||
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| private final val elemSeparator = '\000' | ||
| private final val caseSeparator = '\001' |
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@liufengyun what happens if it is an inline val?
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It should not be an error
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Yes, due to const-fold it's not an error. The checker now runs before const-fold, it thus reports an error.
But I think it's still good to report errors here, as in this case const-fold changes the semantics of programs, which is too subtle for end users.
Note: due to const-fold, the code does not misbehave at runtime. However, it's still good to report errors here, as in this case const-fold changes the semantics of programs, which is too subtle for end users. The field `elemSeparator` and `caseSeparator` are used before they are initialized. -- Error: tests/run/typeclass-derivation2a.scala:31:22 ------------------------- 31 | private final val elemSeparator = '\000' | ^ |Access non-initialized field value elemSeparator. Calling trace: | -> initLabels(0, 0, new mutable.ArrayBuffer[String], new mutable.ArrayBuffer[Array[String]]) [ typeclass-derivation2a.scala:29 ] | -> else if (labelsStr(cur) == elemSeparator) [ typeclass-derivation2a.scala:43 ] -- Error: tests/run/typeclass-derivation2a.scala:32:22 ------------------------- 32 | private final val caseSeparator = '\001' | ^ |Access non-initialized field value caseSeparator. Calling trace: | -> initLabels(0, 0, new mutable.ArrayBuffer[String], new mutable.ArrayBuffer[Array[String]]) [ typeclass-derivation2a.scala:29 ] | -> else if (labelsStr(cur) == caseSeparator) [ typeclass-derivation2a.scala:41 ] 2 errors found
```Scala -- Error: tests/run/tuples1.scala:28:27 ---------------------------------------- 28 | val c0_1 = x0 ++ x1; val c0_1c: Int *: Unit = c0_1c; println(s"c0_1 = $c0_1") | ^ |Access non-initialized field value c0_1c. Calling trace: | -> val c0_1 = x0 ++ x1; val c0_1c: Int *: Unit = c0_1c; println(s"c0_1 = $c0_1") [ tuples1.scala:28 ] -- Error: tests/run/tuples1.scala:29:27 ---------------------------------------- 29 | val c1_0 = x1 ++ x0; val c1_0c: Int *: Unit = c1_0c; println(s"c1_0 = $c1_0") | ^ |Access non-initialized field value c1_0c. Calling trace: | -> val c1_0 = x1 ++ x0; val c1_0c: Int *: Unit = c1_0c; println(s"c1_0 = $c1_0") [ tuples1.scala:29 ] ```
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The field
elemSeparatorandcaseSeparatorare used before they are initialized.