hg: amber/amber: improving error messages

[vicente.romero at oracle.com]

Changeset: 0740462dc9a2
Author:    vromero
Date:      2019-10-31 16:41 -0400
URL:       https://hg.openjdk.java.net/amber/amber/rev/0740462dc9a2

improving error messages

! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/TypeEnter.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties
! test/langtools/tools/javac/diags/examples/AccessorCantThrowException.java
! test/langtools/tools/javac/diags/examples/AccessorReturnTypeDoesntMatch.java
! test/langtools/tools/javac/diags/examples/CanonicalConstructorArgumentMismatch.java
! test/langtools/tools/javac/diags/examples/CanonicalConstructorCantHaveReturn.java
! test/langtools/tools/javac/diags/examples/CanonicalConstructorMustBePublic.java
! test/langtools/tools/javac/diags/examples/MethodMustBePublic.java
! test/langtools/tools/javac/records/RecordCompilationTests.java