Adding debug points in for-comprehension / partial functions

Question

How can I add debug points to statements in for-comprehension?

for {
  a <- sqlQuery1()
  b <- sqlQuery2()
} yield {
  // output
}

I want to inspect as each of the above queries are executed, but simply adding debug points does not seem to work. The queries get executed without ever hitting debug points. I am not sure if it is a limitation of the library being used, language or IDE.

Here is my setup:

• Scala
• IntelliJ IDEA 14.1.3
• Scala Plugin 1.5.200
• Library - Slick 3.0 (Using DBIO Actions)

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Update:

Case 1: with slick

Debug points don't work. Confirmed that again.

Case 2: w/o slick

Debugger does stop at debug points. But sometimes it evaluates expressions and sometimes it does not. I have noticed following problems (in currying / anonymous functions):

1. Variable value is shown as 'Size = ?'
2. Variable value is 'Debug info unavailable'
3. Fails to evaluate expression
4. Cursor stays on the same line without highlighting anything whenever I step over (it is doing things in the background though)
5. 'Warning: No executable code found at...'

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Actually searching without slick as keyword showed me that a lot of people have similar issues, like here.