fix Issue 9885 - IFTI should consider known tuple types
fix Issue 9561 - Many error messages from std.format
Check declaration initializer expressions for nested refs.
Merge pull request #1848 from 9rnsr/fix9561

Issue 9561 - Many error messages from std.format
Merge pull request #1847 from 9rnsr/fix9885

Issue 9885 - IFTI should consider known tuple types
Merge pull request #1854 from ibuclaw/issue8957

Check declaration initializer expressions for nested refs.