hg: lambda/lambda/langtools: Improved support for diagnostic during lambda conversion.

[maurizio.cimadamore at oracle.com]

Changeset: 1cbf9ca0c589
Author:    mcimadamore
Date:      2010-06-22 17:19 +0100
URL:       http://hg.openjdk.java.net/lambda/lambda/langtools/rev/1cbf9ca0c589

Improved support for diagnostic during lambda conversion.
Now the compiler emits more specific info about why a function type cannot be assigned to a SAM type (does not cover method resolution diagnostics).

Examples:

TestX.java:16: incompatible types; target method pippo in class I is not suitable for lambda conversion
I f = #(Integer i) { return new Integer(i); };
      ^
  required: I
  found:    #Integer(Integer)
1 error

Test.java:16: incompatible types; target method pippo in class I is not suitable for lambda conversion
I f = #(Integer i) { return new Integer(i); };
      ^
  required: I
  found:    #Integer(Integer)

Test.java:16: incompatible types; the target type of a lambda conversion must be an abstract class/interface
I f = #(Integer i) { return new Integer(i); };
      ^
  required: I
  found:    #Integer(Integer)

Test.java:16: incompatible types; no target method for lambda conversion found in class I
I f = #(Integer i) { return new Integer(i); };
      ^
  required: I
  found:    #Integer(Integer)

Test.java:16: incompatible types; the target type of a lambda conversion must define a default constructor
I f = #(Integer i) { return new Integer(i); };
      ^
  required: I
  found:    #Integer(Integer)

! src/share/classes/com/sun/tools/javac/code/Types.java
! src/share/classes/com/sun/tools/javac/comp/Check.java
! src/share/classes/com/sun/tools/javac/resources/compiler.properties
! test/tools/javac/lambda/BadConv01.out
! test/tools/javac/lambda/BadConv02.out