Lint function arrow intended context function #23847
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tgodzik
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Sep 2, 2025
| @@ -168,6 +168,7 @@ private sealed trait WarningSettings: | |||
| private val WunstableInlineAccessors = BooleanSetting(WarningSetting, "WunstableInlineAccessors", "Warn an inline methods has references to non-stable binary APIs.") | |||
| private val WtoStringInterpolated = BooleanSetting(WarningSetting, "Wtostring-interpolated", "Warn a standard interpolator used toString on a reference type.") | |||
| private val WrecurseWithDefault = BooleanSetting(WarningSetting, "Wrecurse-with-default", "Warn when a method calls itself with a default argument.") | |||
| private val WdubiousContextual = BooleanSetting(WarningSetting, "Wdubious-contextual", "Warn about T ?=> (t: T) => U.") | |||
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| private val WdubiousContextual = BooleanSetting(WarningSetting, "Wdubious-contextual", "Warn about T ?=> (t: T) => U.") | |
| private val WunlikelyContextual = BooleanSetting(WarningSetting, "Wunlikely-contextual", "Warn about T ?=> (t: T) => U. when a normal function literal was used instead of context one."), |
just because the word is prone to typos for non english speakers and a bit more explanation aside from signature?
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I rely on -Xlint or now -Wall. Though I do like the word "dubious". All warnings are dubious because they begin with -W or "dubya".
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tgodzik
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Sep 3, 2025
| @@ -168,6 +168,7 @@ private sealed trait WarningSettings: | |||
| private val WunstableInlineAccessors = BooleanSetting(WarningSetting, "WunstableInlineAccessors", "Warn an inline methods has references to non-stable binary APIs.") | |||
| private val WtoStringInterpolated = BooleanSetting(WarningSetting, "Wtostring-interpolated", "Warn a standard interpolator used toString on a reference type.") | |||
| private val WrecurseWithDefault = BooleanSetting(WarningSetting, "Wrecurse-with-default", "Warn when a method calls itself with a default argument.") | |||
| private val WdubiousContextual = BooleanSetting(WarningSetting, "Wwrong-arrow", "Warn if function arrow was used instead of context literal ?=>.") | |||
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Suggested change
| private val WdubiousContextual = BooleanSetting(WarningSetting, "Wwrong-arrow", "Warn if function arrow was used instead of context literal ?=>.") | |
| private val WwrongArrow = BooleanSetting(WarningSetting, "Wwrong-arrow", "Warn if function arrow was used instead of context literal ?=>.") |
| @@ -311,6 +312,7 @@ private sealed trait WarningSettings: | |||
| def unstableInlineAccessors(using Context): Boolean = allOr(WunstableInlineAccessors) | |||
| def toStringInterpolated(using Context): Boolean = allOr(WtoStringInterpolated) | |||
| def recurseWithDefault(using Context): Boolean = allOr(WrecurseWithDefault) | |||
| def dubiousContextual(using Context): Boolean = allOr(WdubiousContextual) | |||
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| def dubiousContextual(using Context): Boolean = allOr(WdubiousContextual) | |
| def wrongArrow(using Context): Boolean = allOr(WdubiousContextual) |
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Fixes #21187
If a function literal
x => bodyhas an expected typeX ?=> ?then maybe they intended to writex ?=> body.As shown in the test, maybe types will misalign in other ways to emit warnings.