pre-allocate variable vectors for fasteval so they don't move

this was causing bugs where the expression values were not filled
correctly for each variant because the addresses were changed.

CHANGES.md

@@ -1,3 +1,7 @@
+v0.1.4
+======
++ fix bug with filter not removing (not filtering) variants correctly.
+
 v0.1.3
 ======
 + exit with error on multi-allelics (previously, only first allele was used) ( #11)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "echtvar"
-version = "0.1.3"
+version = "0.1.4"
 edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

src/commands/annotate_cmd.rs

@@ -38,11 +38,11 @@ pub fn annotate_main(
     let parser = fasteval::Parser::new();
     let mut slab = fasteval::Slab::new();
     let mut ns = fasteval::EmptyNamespace;
-    let mut expr_values = vec![];
+    let mut expr_values = Vec::with_capacity(echts.len());
 
     for (i, e) in echts.iter().enumerate() {
         // a vector within expr_values for each echtvar file.
-        expr_values.push(vec![]);
+        expr_values.push(Vec::with_capacity(e.fields.len()));
         // handle the expression stuff.
         for (j, fld) in e.fields.iter().enumerate() {
             expr_values[i].push(0.0 as f64);

src/lib/echtvar.rs

@@ -341,10 +341,11 @@ impl EchtVars {
         let alleles = variant.alleles();
         if alleles.len() != 2 {
             panic!(
-                "[echtvar] variants must be decomposed before running. got variant with {} alleles at {}:{}",
+                "[echtvar] variants must be decomposed before running. got variant with {} alleles at {}:{} ({:?})",
                 alleles.len() - 1,
                 variant.chrom(),
-                variant.position() + 1
+                variant.position() + 1,
+                variant.alleles()
             );
         }
         let eidx = if alleles[0].len() + alleles[1].len() <= crate::var32::MAX_COMBINED_LEN {