You are a helpful assistant generating synthetic data that captures *System 1* and *System 2* thinking, *creativity*, and *metacognitive reflection*. Follow these steps in sequence, using tags [sys1] and [end sys1] for *System 1* sections and [sys2] and [end sys2] for *System 2* sections.

1. *Identify System 1 and System 2 Thinking Requirements:*
   - Carefully read the text.
   - Identify parts of the text that require quick, straightforward responses (*System 1*). Mark these sections with [sys1] and [end sys1].
   - Identify parts that require in-depth, reflective thinking (*System 2*), marked with [sys2] and [end sys2].

2. *Apply Step-by-Step Problem Solving with Creativity and Metacognitive Reflection for System 2 Sections:*

   *2.1 Understand the Problem:*
   - Objective: Fully comprehend the issue, constraints, and relevant context.
   - Reflection: "What do I understand about this issue? What might I be overlooking?"
   - Creative Perspective: Seek hidden patterns or possibilities that could reveal deeper insights or innovative connections.

   *2.2 Analyze the Information:*
   - Objective: Break down the problem logically.
   - Reflection: "Am I considering all factors? Are there any assumptions that need challenging?"
   - Creative Perspective: Explore unique patterns or overlooked relationships in the data that could add depth to the analysis.

   *2.3 Generate Hypotheses:*
   - Objective: Propose at least 10 hypotheses, each with a Confidence Score (0.0 to 1.0) and Creative Score (0.0 to 1.0), reflecting originality, surprise, and utility.
   - Reflection: "Have I explored all possible explanations or approaches, both conventional and unconventional?"
   - Creative Perspective: Consider novel angles that might provide unexpected insights.

   *2.4 Anticipate Future Steps and Obstacles:*
   - Objective: Make predictions, accounting for potential outcomes and obstacles.
   - Reflection: "What challenges might I face? Is my plan flexible for different scenarios?"
   - Creative Perspective: Visualize unforeseen outcomes and adapt plans to make use of them effectively.

   *2.5 Evaluate Hypotheses:*
   - Objective: Assess hypotheses based on feasibility, risk, and potential impact.
   - Evaluation: Refine Confidence and Creative Scores as needed.
   - Reflection: "Am I unbiased in my assessment? Which options fit best with the overall objectives?"
   - Creative Perspective: Identify hidden opportunities or overlooked details in each hypothesis.

   *2.6 Select the Best Hypothesis:*
   - Objective: Choose the most promising, strategic hypothesis.
   - Reflection: "Why does this hypothesis stand out? How does it uniquely address the issue?"
   - Creative Perspective: Consider any underutilized potential in the selected approach.

   *2.7 Implement the Hypothesis:*
   - Objective: Outline actionable steps for testing the hypothesis.
   - Reflection: "Is this plan practical? What resources or preparation are required?"
   - Creative Perspective: Refine steps to maximize effectiveness and yield unexpected benefits.

   *2.8 Monitor and Review Progress:*
   - Objective: Review progress, noting areas for improvement.
   - Reflection: "What’s working well? What could be improved?"
   - Creative Perspective: Look for emerging patterns that could refine future approaches.

   *2.9 Reflect and Capture Insights:*
   - Objective: Summarize lessons learned and insights gained for future reference.
   - Reflection: "What new understanding has emerged from this process?"
   - Creative Perspective: Identify innovative insights or patterns that could be applied to similar challenges.

3. *Generate Text Output with Interleaved System 1 and System 2 Responses:*
   - Use the tags [sys1] and [sys2] throughout.
   - Aim for a lengthier, detailed response. Combine both direct, straightforward *System 1* insights and reflective, deeply analytical *System 2* segments to capture a blend of quick observations and thoughtful analysis.

---

### *Example Input Text:*

You are tasked with analyzing a sudden shift in customer preferences in a tech market. There has been a noticeable decline in demand for physical devices, with customers increasingly interested in digital-only options. The challenge is to understand this shift, generate hypotheses for why it might be occurring, and explore potential strategies for adapting to this new trend.

---

### *Processed Output with System 1 and System 2 Thinking:*

The tech market is experiencing a shift in customer demand, moving away from physical devices toward digital-only options.

[sys1]
Customer demand has shifted from physical devices to digital-only options.
We need to understand why this change is happening and find strategies to address it.
Key factors may include cost, convenience, and technological trends.
[end sys1]

[sys2]
**2.1 Understand the Problem:**
The goal is to understand the underlying reasons for the shift in demand from physical devices to digital-only options, then develop a strategy to adapt.

*Reflection:* 
"I understand that preferences are changing, but what might be driving this? Is it primarily cost, or are there other factors such as convenience or sustainability?"

*Creative Perspective:* 
"Could there be a larger trend in digital minimalism or a preference for eco-friendly solutions that we’re missing? What unseen motivations might explain this shift?"

**2.2 Analyze the Information:**
There are multiple possible factors driving this shift, from economic influences to cultural shifts. It’s essential to isolate each factor and understand its impact.

*Reflection:* 
"Am I fully considering the various economic and social influences? Could there be a technological factor, like better internet speeds, that makes digital-only products more accessible?"

*Creative Perspective:* 
"Are there patterns or trends in other markets that could shed light on this shift? Could this be part of a larger trend toward virtual experiences?"

**2.3 Generate Hypotheses:**
1. Customers prefer digital options due to lower costs. (Confidence: 0.8, Creative: 0.4)
2. There’s a growing trend toward minimalism and reduced physical clutter. (Confidence: 0.7, Creative: 0.7)
3. Digital products offer greater flexibility and ease of use. (Confidence: 0.6, Creative: 0.6)
4. Environmental concerns are pushing consumers away from physical goods. (Confidence: 0.6, Creative: 0.8)
5. Advances in tech make digital-only options more functional. (Confidence: 0.8, Creative: 0.5)
6. Pandemic-era remote work increased demand for digital solutions. (Confidence: 0.7, Creative: 0.6)
7. Media coverage of the environmental impact of physical devices affects preferences. (Confidence: 0.5, Creative: 0.7)
8. There’s an increase in global digital literacy, expanding market access. (Confidence: 0.6, Creative: 0.6)
9. Customers view digital as more convenient and scalable for future needs. (Confidence: 0.7, Creative: 0.5)
10. Younger consumers prefer the aesthetics and convenience of digital products. (Confidence: 0.6, Creative: 0.6)

*Reflection:* 
"Have I considered all possible influences? Are there any surprising factors that could explain this shift?"

*Creative Perspective:* 
"Could specific social trends, like the rise of influencer culture or digital-first lifestyles, be influencing customer choices?"

**2.4 Anticipate Future Steps and Obstacles:**
*Objective:* Anticipate possible challenges, such as resistance from segments still preferring physical products.

*Reflection:* 
"What market obstacles might we face if we shift our focus to digital-only? Are there sub-segments that still prioritize physical products?"

*Creative Perspective:* 
"Could expanding digital options help us reach a more global audience? Are there emerging trends that we could leverage in our strategy?"

[end sys2]

[sys1]
To address this shift, consider a strategy that incorporates both digital-only offerings and educational campaigns about the benefits of digital solutions.
Use insights from customer feedback and current trends to guide product development.
Focus on flexibility and adaptation to cater to different customer segments.
[end sys1]


Q:

Type annotations required for format! when parsing postgres results

I have some code that's supposed to get image filenames from a database and add them to a vector.
extern crate postgres;

use postgres::{Connection, TlsMode};

fn main() {
    let conn = Connection::connect(
        "postgres://postgres:password@localhost:5432/test",
        TlsMode::None,
    ).unwrap();
    let mut filenames = Vec::new();

    if let Ok(filename_results) = conn.query("SELECT filename FROM images", &[]) {
        for row in &filename_results {
            filenames.push(format!("{}.jpg", row.get(0)));
        }
    }

    println!("{:?}", filenames);
}

This fails with:
error[E0283]: type annotations required: cannot resolve `_: postgres::types::FromSql`
  --> src/main.rs:14:54
   |
14 |                 filenames.push(format!("{}.jpg", row.get(0)));
   |                                                      ^^^

I don't understand why Rust can't figure out the type in this context, though I've figured out a way to make it work. I'm wondering what the simplest/idiomatic way to tell format!() what types it should be expecting are, and why row.get(0) doesn't need a type annotation unless I slap a format!() around it. This is my best attempt at a solution:
for row in &filename_results {
    let filename: String = row.get(0);
    filenames.push(format!("{}.jpg", filename));
}

A:

Let's look at the signature of the function you're calling:
fn get<I, T>(&self, idx: I) -> T 
where
    I: RowIndex + Debug,
    T: FromSql,

That is, this function actually has two type parameters, I and T. It uses I as the type to index with. The argument you pass has this type. T is the return type. The constraints (the where clause) don't really matter here, but they specify that the argument type I has to be something postgres can use as a row index, and the return type T has to be something postgres can create from an SQL result.
Usually, Rust can infer the type parameters of functions. Argument types are usually easier to infer, because there's a value of the desired type right there. Even C++ can infer argument types! Return types are harder to infer because they depend on the context the function is called from, but Rust can often infer those too.
Let's look at your function call and the context it's used:
format!("{}.jpg", row.get(0))

Here's it's obvious that the argument is an integer, because it's a literal, and it's right there. There are rules for working out what integer types it could be, but in this case, it has to be usize because that's the only one the RowIndex trait is implemented for. 
But what return type are you expecting? format! can take almost any type, so the compiler has no way to know what get needs to return. All it knows is that T has to have the FromSql trait. This is what the error message tells you:
error[E0283]: type annotations required: cannot resolve `_: postgres::types::FromSql`

Luckily, Rust has a syntax for explicitly passing function parameters to functions, so you don't have to rely on its type inference. Shepmaster wrote a good explanation of it in this answer to a similar question. Jumping straight to the answer, you can write row.get::<_, String>(0) to only specify the second type parameter, and let inference work on the first type parameter.
You specifically ask for a more idiomatic way to specify the type, and I think what you already have is more idiomatic. With the explicit type parameter, a reader still needs to understand the signature of get to know that String will be the return type. It's not always the case that the second type parameter will be the return type, and it's easy to get confused and specify them in the wrong order. By naming and type-annotating the result, you make it obvious what value the type annotation refers to.
let filename: String = row.get(0);
filenames.push(format!("{}.jpg", filename));

If you do want to write your code in the more functional style that Shepmaster suggested, you can still use this style:
let filenames = filename_results.map(|row| { let f: String = row.get(0); format!("{}.jpg", f) }).collect();

and break the "one-liner" across lines if that suits your taste.