Dynamically load find/make specializations graph if there are no type errors

crates/cli/src/build.rs

@@ -35,6 +35,13 @@ pub struct BuiltFile {
     pub interns: Interns,
 }
 
+pub enum BuildOrdering {
+    /// Run up through typechecking first; continue building iff that is successful.
+    BuildIfChecks,
+    /// Always build the Roc binary, even if there are type errors.
+    AlwaysBuild,
+}
+
 #[allow(clippy::too_many_arguments)]
 pub fn build_file<'a>(
     arena: &'a Bump,
@@ -48,6 +55,7 @@ pub fn build_file<'a>(
     precompiled: bool,
     threading: Threading,
     wasm_dev_stack_bytes: Option<u32>,
+    order: BuildOrdering,
 ) -> Result<BuiltFile, LoadingProblem<'a>> {
     let compilation_start = Instant::now();
     let target_info = TargetInfo::from(target);
@@ -55,12 +63,17 @@ pub fn build_file<'a>(
     // Step 1: compile the app and generate the .o file
     let subs_by_module = Default::default();
 
+    let exec_mode = match order {
+        BuildOrdering::BuildIfChecks => ExecutionMode::ExecutableIfCheck,
+        BuildOrdering::AlwaysBuild => ExecutionMode::Executable,
+    };
+
     let load_config = LoadConfig {
         target_info,
         // TODO: expose this from CLI?
         render: RenderTarget::ColorTerminal,
         threading,
-        exec_mode: ExecutionMode::Executable,
+        exec_mode,
     };
     let loaded = roc_load::load_and_monomorphize(
         arena,

crates/cli/src/lib.rs

@@ -33,6 +33,8 @@ pub mod build;
 mod format;
 pub use format::format;
 
+use crate::build::BuildOrdering;
+
 const DEFAULT_ROC_FILENAME: &str = "main.roc";
 
 pub const CMD_BUILD: &str = "build";
@@ -521,6 +523,10 @@ pub fn build(
         .and_then(|s| s.parse::<u32>().ok())
         .map(|x| x * 1024);
 
+    let build_ordering = match config {
+        BuildAndRunIfNoErrors => BuildOrdering::BuildIfChecks,
+        _ => BuildOrdering::AlwaysBuild,
+    };
     let res_binary_path = build_file(
         &arena,
         &triple,
@@ -533,6 +539,7 @@ pub fn build(
         precompiled,
         threading,
         wasm_dev_stack_bytes,
+        build_ordering,
     );
 
     match res_binary_path {