crystal-lang
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+0 −28 Compiler-error-messages.md
diff --git a/Compiler-error-messages.md b/Compiler-error-messages.md
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-# can't infer block return type
-
-For example:
-
-```crystal
-class Foo
-  def initialize(@name)
-  end
-
-  def name
-    @name
-  end
-end
-
-a = [] of Foo
-x = a.map { |f| f.name } #=> error: can't infer block type, try to cast the block body with `as`
-```
-
-Here `Foo` was never instantiated so the compiler has no way of knowing what the type of `@name` is.
-
-To solve this, cast the block body with `as`:
-
-```crystal
-x = a.map { |f| f.name.as(String) } # works
-```
-
-In the future we want to get rid of this error messages and make the compiler smarter. In the above case `@name` could be deduced to be `Void` or `NoReturn`, but for now you have to use this workaround.
-